From c838a51cbc6f416b97c7dfe1d319a16a922125b1 Mon Sep 17 00:00:00 2001
From: "Wakefield-Olson, Allan M." <amwakefield-olson@fedins.com>
Date: Wed, 25 Mar 2026 11:29:54 -0500
Subject: [PATCH 1/4] Update configuration for Java 21 support and clean up
 outdated versions

---
 .circleci/config.yml |  52 +----
 CHANGELOG.md         |   4 +
 pom.xml              | 537 ++++++++++++++++++++++---------------------
 3 files changed, 276 insertions(+), 317 deletions(-)

diff --git a/.circleci/config.yml b/.circleci/config.yml
index c943ca0..07b337b 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -3,54 +3,6 @@ version: 2.1
 workflows:
   tests:
     jobs:
-      - unit-tests:
-          name: java8
-          image: "cimg/openjdk"
-          version: "8.0"
-      - unit-tests:
-          name: java9
-          image: "circleci/openjdk"
-          version: "9"
-      - unit-tests:
-          name: java10
-          image: "circleci/openjdk"
-          version: "10"
-      - unit-tests:
-          name: java11
-          image: "cimg/openjdk"
-          version: "11.0"
-      - unit-tests:
-          name: java12
-          image: "cimg/openjdk"
-          version: "12.0.2"
-      - unit-tests:
-          name: java13
-          image: "cimg/openjdk"
-          version: "13.0.0"
-      - unit-tests:
-          name: java14
-          image: "cimg/openjdk"
-          version: "14.0.0"
-      - unit-tests:
-          name: java15
-          image: "cimg/openjdk"
-          version: "15.0.0"
-      - unit-tests:
-          name: java16
-          image: "cimg/openjdk"
-          version: "16.0.0"
-      - unit-tests:
-          name: java17
-          image: "cimg/openjdk"
-          version: "17.0"
-      - unit-tests:
-          name: java18
-          image: "cimg/openjdk"
-          version: "18.0.1"
-      - unit-tests:
-          name: java19
-          image: "cimg/openjdk"
-          version: "19.0.0"
       - unit-tests:
           name: java21
           image: "cimg/openjdk"
@@ -78,7 +30,7 @@ workflows:
 jobs:
   security-scan:
     docker:
-      - image: cimg/openjdk:11.0
+      - image: cimg/openjdk:21.0
     steps:
       - checkout
       - run:
@@ -118,4 +70,4 @@ jobs:
           command: mvn install -DskipTests=true -Dmaven.javadoc.skip=true -Dgpg.skip=true -B -V
       - run:
           name: Run tests
-          command: mvn test -DforkCount=1 -DreuseForks=false 
+          command: mvn test -DforkCount=1 -DreuseForks=false
diff --git a/CHANGELOG.md b/CHANGELOG.md
index d7540d9..ef5dad0 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,9 @@
 # Changelog
 
+## 2.0.0
+* Update SDK to Java21
+* This fixes a compression issue with Java 21 applications when converting the response body of the requests.
+
 ## 1.13.0
 
 * A new feature (metadata on InboundMessage)
diff --git a/pom.xml b/pom.xml
index 33bedc8..a7b5468 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,280 +1,283 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0"
-         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-    <modelVersion>4.0.0</modelVersion>
-
-    <!-- base library details -->
-    <groupId>com.postmarkapp</groupId>
-    <artifactId>postmark</artifactId>
-    <version>${postmark.version}</version>
-    <name>postmark</name>
-    <description>Postmark is a transactional email service provider.</description>
+  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+  <modelVersion>4.0.0</modelVersion>
+
+  <!-- base library details -->
+  <groupId>com.postmarkapp</groupId>
+  <artifactId>postmark</artifactId>
+  <version>${postmark.version}</version>
+  <name>postmark</name>
+  <description>Postmark is a transactional email service provider.</description>
+  <url>https://github.com/activecampaign/postmark-java</url>
+
+  <developers>
+    <developer>
+      <name>Igor Balos</name>
+      <organization>ActiveCampaign</organization>
+      <organizationUrl>https://www.activecampaign.com</organizationUrl>
+      <url>https://twitter.com/ibalosh/</url>
+      <email>ibalosh@gmail.com</email>
+    </developer>
+  </developers>
+
+  <properties>
+    <postmark.version>1.13.0</postmark.version>
+    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    <java.version>21</java.version>
+    <jackson.minimum.version>2.9.7</jackson.minimum.version>
+    <jackson.version>2.15.0</jackson.version>
+    <junit.jupiter.version>5.8.2</junit.jupiter.version>
+    <junit.platform.version>1.3.2</junit.platform.version>
+  </properties>
+
+  <licenses>
+    <license>
+      <name>MIT License</name>
+      <url>http://www.opensource.org/licenses/mit-license.php</url>
+      <distribution>repo</distribution>
+    </license>
+  </licenses>
+
+  <scm>
     <url>https://github.com/activecampaign/postmark-java</url>
+    <connection>scm:git@github.com:ActiveCampaign/postmark-java.git</connection>
+    <developerConnection>scm:git@github.com:ActiveCampaign/postmark-java.git</developerConnection>
+  </scm>
+
+  <dependencies>
+
+    <dependency>
+      <groupId>org.apache.httpcomponents.client5</groupId>
+      <artifactId>httpclient5</artifactId>
+      <version>5.5</version>
+    </dependency>
+
+    <!-- Serialization to JSON -->
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-core</artifactId>
+      <version>2.15.0</version>
+    </dependency>
+
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-annotations</artifactId>
+      <version>2.15.0</version>
+    </dependency>
+
+    <dependency>
+      <groupId>com.fasterxml.jackson.core</groupId>
+      <artifactId>jackson-databind</artifactId>
+      <version>2.15.0</version>
+    </dependency>
+
+    <!-- MIME auto detect on files -->
+    <dependency>
+      <groupId>org.apache.tika</groupId>
+      <artifactId>tika-core</artifactId>
+      <version>3.2.3</version>
+    </dependency>
+
+
+    <!-- Testing dependencies -->
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-api</artifactId>
+      <version>5.8.2</version>
+      <scope>test</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>org.junit.jupiter</groupId>
+      <artifactId>junit-jupiter-engine</artifactId>
+      <version>5.8.2</version>
+      <scope>test</scope>
+    </dependency>
+
+    <dependency>
+      <groupId>org.junit.platform</groupId>
+      <artifactId>junit-platform-runner</artifactId>
+      <version>1.8.0</version>
+      <scope>test</scope>
+    </dependency>
+
+    <!-- Mocking objects testing dependencies -->
+    <dependency>
+      <groupId>org.mockito</groupId>
+      <artifactId>mockito-core</artifactId>
+      <version>4.11.0</version>
+      <scope>test</scope>
+    </dependency>
+  </dependencies>
+
+  <!-- all of the below is needed for releasing -->
+  <build>
+    <plugins>
+
+      <!-- Maven plugin -->
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-compiler-plugin</artifactId>
+        <version>3.13.0</version>
+        <configuration>
+          <source>${java.version}</source>
+          <target>${java.version}</target>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-surefire-plugin</artifactId>
+        <version>3.2.5</version>
+        <configuration>
+          <useSystemClassLoader>false</useSystemClassLoader>
+          <forkCount>1</forkCount>
+          <reuseForks>false</reuseForks>
+        </configuration>
+      </plugin>
+
+      <plugin>
+        <groupId>org.apache.maven.plugins</groupId>
+        <artifactId>maven-failsafe-plugin</artifactId>
+        <version>3.2.5</version>
+      </plugin>
+    </plugins>
+
+    <!-- Resources path -->
+    <resources>
+      <resource>
+        <directory>src/main/resources</directory>
+        <filtering>true</filtering>
+      </resource>
+    </resources>
+  </build>
+
+  <!-- mvn deploy -P releaseId
+    first release SNAPSHOT (with name SNAPSHOT in version, then release)
+    -->
 
-    <developers>
-        <developer>
-            <name>Igor Balos</name>
-            <organization>ActiveCampaign</organization>
-            <organizationUrl>https://www.activecampaign.com</organizationUrl>
-            <url>https://twitter.com/ibalosh/</url>
-            <email>ibalosh@gmail.com</email>
-        </developer>
-    </developers>
-
-    <properties>
-        <postmark.version>1.13.0</postmark.version>
-        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-        <java.version>1.8</java.version>
-        <jackson.minimum.version>2.9.7</jackson.minimum.version>
-        <jackson.version>2.15.0</jackson.version>
-        <junit.jupiter.version>5.8.2</junit.jupiter.version>
-        <junit.platform.version>1.3.2</junit.platform.version>
-    </properties>
-
-    <licenses>
-        <license>
-            <name>MIT License</name>
-            <url>http://www.opensource.org/licenses/mit-license.php</url>
-            <distribution>repo</distribution>
-        </license>
-    </licenses>
-
-    <scm>
-        <url>https://github.com/activecampaign/postmark-java</url>
-        <connection>scm:git@github.com:ActiveCampaign/postmark-java.git</connection>
-        <developerConnection>scm:git@github.com:ActiveCampaign/postmark-java.git</developerConnection>
-    </scm>
-
-    <dependencies>
-
-        <dependency>
-            <groupId>org.apache.httpcomponents.client5</groupId>
-            <artifactId>httpclient5</artifactId>
-            <version>5.5</version>
-        </dependency>
-
-        <!-- Serialization to JSON -->
-        <dependency>
-            <groupId>com.fasterxml.jackson.core</groupId>
-            <artifactId>jackson-core</artifactId>
-            <version>2.15.0</version>
-        </dependency>
-
-        <dependency>
-            <groupId>com.fasterxml.jackson.core</groupId>
-            <artifactId>jackson-annotations</artifactId>
-            <version>2.15.0</version>
-        </dependency>
-
-        <dependency>
-            <groupId>com.fasterxml.jackson.core</groupId>
-            <artifactId>jackson-databind</artifactId>
-            <version>2.15.0</version>
-        </dependency>
-
-        <!-- MIME auto detect on files -->
-        <dependency>
-            <groupId>org.apache.tika</groupId>
-            <artifactId>tika-core</artifactId>
-            <version>2.9.4</version>
-        </dependency>
-
-
-        <!-- Testing dependencies -->
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-api</artifactId>
-            <version>5.8.2</version>
-            <scope>test</scope>
-        </dependency>
-
-        <dependency>
-            <groupId>org.junit.jupiter</groupId>
-            <artifactId>junit-jupiter-engine</artifactId>
-            <version>5.8.2</version>
-            <scope>test</scope>
-        </dependency>
-
-        <dependency>
-            <groupId>org.junit.platform</groupId>
-            <artifactId>junit-platform-runner</artifactId>
-            <version>1.8.0</version>
-            <scope>test</scope>
-        </dependency>
-
-        <!-- Mocking objects testing dependencies -->
-        <dependency>
-            <groupId>org.mockito</groupId>
-            <artifactId>mockito-core</artifactId>
-            <version>2.11.0</version>
-            <scope>test</scope>
-        </dependency>
-    </dependencies>
-
-    <!-- all of the below is needed for releasing -->
-    <build>
-        <plugins>
+  <profiles>
+    <profile>
+      <id>release</id>
 
-            <!-- Maven plugin -->
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-compiler-plugin</artifactId>
-                <version>3.8.1</version>
-                <configuration>
-                    <source>${java.version}</source>
-                    <target>${java.version}</target>
-                </configuration>
-            </plugin>
+      <activation>
+        <property>
+          <name>performRelease</name>
+        </property>
+      </activation>
 
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-surefire-plugin</artifactId>
-                <version>2.22.2</version>
-                <!-- workaround line to make test work on java10 https://maven.apache.org/surefire/maven-surefire-plugin/examples/class-loading.html -->
+      <build>
+        <plugins>
+          <!-- Release files to Maven server plugin -->
+          <plugin>
+            <groupId>org.sonatype.plugins</groupId>
+            <artifactId>nexus-staging-maven-plugin</artifactId>
+            <version>1.6.7</version>
+            <extensions>true</extensions>
+            <configuration>
+              <serverId>central</serverId>
+              <nexusUrl>https://ossrh-staging-api.central.sonatype.com/</nexusUrl>
+              <autoReleaseAfterClose>true</autoReleaseAfterClose>
+            </configuration>
+          </plugin>
+
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-source-plugin</artifactId>
+            <version>2.2.1</version>
+            <executions>
+              <execution>
+                <id>attach-sources</id>
+                <goals>
+                  <goal>jar-no-fork</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+
+          <!-- generate javadocs -->
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-javadoc-plugin</artifactId>
+            <version>3.6.3</version>
+            <executions>
+              <execution>
+                <id>attach-javadocs</id>
+                <goals>
+                  <goal>jar</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+
+          <!-- Signing files for release plugin -->
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-gpg-plugin</artifactId>
+            <version>1.6</version>
+            <executions>
+              <execution>
+                <id>sign-artifacts</id>
+                <phase>verify</phase>
+                <goals>
+                  <goal>sign</goal>
+                </goals>
+              </execution>
+            </executions>
+          </plugin>
+          <!-- Maven dependency enforcer plugin -->
+          <plugin>
+            <groupId>org.apache.maven.plugins</groupId>
+            <artifactId>maven-enforcer-plugin</artifactId>
+            <version>3.0.0-M2</version>
+
+            <executions>
+              <execution>
+                <id>enforce-banned-dependencies</id>
+                <goals>
+                  <goal>enforce</goal>
+                </goals>
                 <configuration>
-                    <useSystemClassLoader>false</useSystemClassLoader>
-                    <forkCount>1</forkCount>
-                    <reuseForks>false</reuseForks>
+                  <rules>
+                    <bannedDependencies>
+                      <searchTransitive>true</searchTransitive>
+                      <excludes>
+                        <exclude>
+                          com.fasterxml.jackson.core:jackson-annotations:(,${jackson.minimum.version}]</exclude>
+                        <exclude>
+                          com.fasterxml.jackson.core:jackson-core:jar:(,${jackson.minimum.version}]</exclude>
+                        <exclude>
+                          com.fasterxml.jackson.core:jackson-databind:jar:(,${jackson.minimum.version}]</exclude>
+                      </excludes>
+                      <message>A banned dependency was found! Need to use jackson newer than
+                        ${jackson.minimum.version}.</message>
+                    </bannedDependencies>
+                  </rules>
+                  <fail>true</fail>
                 </configuration>
-            </plugin>
+              </execution>
+            </executions>
+          </plugin>
 
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-failsafe-plugin</artifactId>
-                <version>2.22.2</version>
-            </plugin>
         </plugins>
+      </build>
 
-        <!-- Resources path -->
-        <resources>
-            <resource>
-                <directory>src/main/resources</directory>
-                <filtering>true</filtering>
-            </resource>
-        </resources>
-    </build>
+      <!-- Maven deploy repository setting -->
+      <distributionManagement>
+        <snapshotRepository>
+          <id>central</id>
+          <url>https://central.sonatype.com/repository/maven-snapshots/</url>
+        </snapshotRepository>
+        <repository>
+          <id>central</id>
+          <url>https://ossrh-staging-api.central.sonatype.com/service/local/staging/deploy/maven2/</url>
+        </repository>
+      </distributionManagement>
 
-    <!-- mvn deploy -P releaseId
-    first release SNAPSHOT (with name SNAPSHOT in version, then release)
-    -->
 
-    <profiles>
-        <profile>
-            <id>release</id>
-
-            <activation>
-                <property>
-                    <name>performRelease</name>
-                </property>
-            </activation>
-
-            <build>
-            <plugins>
-                <!-- Release files to Maven server plugin -->
-                <plugin>
-                    <groupId>org.sonatype.plugins</groupId>
-                    <artifactId>nexus-staging-maven-plugin</artifactId>
-                    <version>1.6.7</version>
-                    <extensions>true</extensions>
-                    <configuration>
-                        <serverId>central</serverId>
-                        <nexusUrl>https://ossrh-staging-api.central.sonatype.com/</nexusUrl>
-                        <autoReleaseAfterClose>true</autoReleaseAfterClose>
-                    </configuration>
-                </plugin>
-
-                <plugin>
-                    <groupId>org.apache.maven.plugins</groupId>
-                    <artifactId>maven-source-plugin</artifactId>
-                    <version>2.2.1</version>
-                    <executions>
-                        <execution>
-                            <id>attach-sources</id>
-                            <goals>
-                                <goal>jar-no-fork</goal>
-                            </goals>
-                        </execution>
-                    </executions>
-                </plugin>
-
-                <!-- generate javadocs -->
-                <plugin>
-                    <groupId>org.apache.maven.plugins</groupId>
-                    <artifactId>maven-javadoc-plugin</artifactId>
-                    <version>2.9.1</version>
-                    <executions>
-                        <execution>
-                            <id>attach-javadocs</id>
-                            <goals>
-                                <goal>jar</goal>
-                            </goals>
-                        </execution>
-                    </executions>
-                </plugin>
-
-                <!-- Signing files for release plugin -->
-                <plugin>
-                    <groupId>org.apache.maven.plugins</groupId>
-                    <artifactId>maven-gpg-plugin</artifactId>
-                    <version>1.6</version>
-                    <executions>
-                        <execution>
-                            <id>sign-artifacts</id>
-                            <phase>verify</phase>
-                            <goals>
-                                <goal>sign</goal>
-                            </goals>
-                        </execution>
-                    </executions>
-                </plugin>
-            <!-- Maven dependency enforcer plugin -->
-            <plugin>
-                <groupId>org.apache.maven.plugins</groupId>
-                <artifactId>maven-enforcer-plugin</artifactId>
-                <version>3.0.0-M2</version>
-
-                <executions>
-                    <execution>
-                        <id>enforce-banned-dependencies</id>
-                        <goals>
-                            <goal>enforce</goal>
-                        </goals>
-                        <configuration>
-                            <rules>
-                                <bannedDependencies>
-                                    <searchTransitive>true</searchTransitive>
-                                    <excludes>
-                                        <exclude>com.fasterxml.jackson.core:jackson-annotations:(,${jackson.minimum.version}]</exclude>
-                                        <exclude>com.fasterxml.jackson.core:jackson-core:jar:(,${jackson.minimum.version}]</exclude>
-                                        <exclude>com.fasterxml.jackson.core:jackson-databind:jar:(,${jackson.minimum.version}]</exclude>
-                                    </excludes>
-                                    <message>A banned dependency was found! Need to use jackson newer than ${jackson.minimum.version}.</message>
-                                </bannedDependencies>
-                            </rules>
-                            <fail>true</fail>
-                        </configuration>
-                    </execution>
-                </executions>
-            </plugin>
-
-            </plugins>
-            </build>
-
-            <!-- Maven deploy repository setting -->
-            <distributionManagement>
-                <snapshotRepository>
-                    <id>central</id>
-                    <url>https://central.sonatype.com/repository/maven-snapshots/</url>
-                </snapshotRepository>
-                <repository>
-                    <id>central</id>
-                    <url>https://ossrh-staging-api.central.sonatype.com/service/local/staging/deploy/maven2/</url>
-                </repository>
-            </distributionManagement>
-
-
-        </profile>
-    </profiles>
-
-</project>
\ No newline at end of file
+    </profile>
+  </profiles>
+
+</project>

From 2b2f4ecc755f0200978c498a1b36f14a841e363c Mon Sep 17 00:00:00 2001
From: "Wakefield-Olson, Allan M." <amwakefield-olson@fedins.com>
Date: Wed, 25 Mar 2026 11:35:20 -0500
Subject: [PATCH 2/4] Update pom.xml for Java 21 compatibility and dependency
 management

---
 pom.xml | 540 ++++++++++++++++++++++++++++----------------------------
 1 file changed, 270 insertions(+), 270 deletions(-)

diff --git a/pom.xml b/pom.xml
index a7b5468..47b645a 100644
--- a/pom.xml
+++ b/pom.xml
@@ -1,283 +1,283 @@
 <?xml version="1.0" encoding="UTF-8"?>
 <project xmlns="http://maven.apache.org/POM/4.0.0"
-  xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
-  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
-  <modelVersion>4.0.0</modelVersion>
-
-  <!-- base library details -->
-  <groupId>com.postmarkapp</groupId>
-  <artifactId>postmark</artifactId>
-  <version>${postmark.version}</version>
-  <name>postmark</name>
-  <description>Postmark is a transactional email service provider.</description>
-  <url>https://github.com/activecampaign/postmark-java</url>
-
-  <developers>
-    <developer>
-      <name>Igor Balos</name>
-      <organization>ActiveCampaign</organization>
-      <organizationUrl>https://www.activecampaign.com</organizationUrl>
-      <url>https://twitter.com/ibalosh/</url>
-      <email>ibalosh@gmail.com</email>
-    </developer>
-  </developers>
-
-  <properties>
-    <postmark.version>1.13.0</postmark.version>
-    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
-    <java.version>21</java.version>
-    <jackson.minimum.version>2.9.7</jackson.minimum.version>
-    <jackson.version>2.15.0</jackson.version>
-    <junit.jupiter.version>5.8.2</junit.jupiter.version>
-    <junit.platform.version>1.3.2</junit.platform.version>
-  </properties>
-
-  <licenses>
-    <license>
-      <name>MIT License</name>
-      <url>http://www.opensource.org/licenses/mit-license.php</url>
-      <distribution>repo</distribution>
-    </license>
-  </licenses>
-
-  <scm>
+         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <!-- base library details -->
+    <groupId>com.postmarkapp</groupId>
+    <artifactId>postmark</artifactId>
+    <version>${postmark.version}</version>
+    <name>postmark</name>
+    <description>Postmark is a transactional email service provider.</description>
     <url>https://github.com/activecampaign/postmark-java</url>
-    <connection>scm:git@github.com:ActiveCampaign/postmark-java.git</connection>
-    <developerConnection>scm:git@github.com:ActiveCampaign/postmark-java.git</developerConnection>
-  </scm>
-
-  <dependencies>
-
-    <dependency>
-      <groupId>org.apache.httpcomponents.client5</groupId>
-      <artifactId>httpclient5</artifactId>
-      <version>5.5</version>
-    </dependency>
-
-    <!-- Serialization to JSON -->
-    <dependency>
-      <groupId>com.fasterxml.jackson.core</groupId>
-      <artifactId>jackson-core</artifactId>
-      <version>2.15.0</version>
-    </dependency>
-
-    <dependency>
-      <groupId>com.fasterxml.jackson.core</groupId>
-      <artifactId>jackson-annotations</artifactId>
-      <version>2.15.0</version>
-    </dependency>
-
-    <dependency>
-      <groupId>com.fasterxml.jackson.core</groupId>
-      <artifactId>jackson-databind</artifactId>
-      <version>2.15.0</version>
-    </dependency>
-
-    <!-- MIME auto detect on files -->
-    <dependency>
-      <groupId>org.apache.tika</groupId>
-      <artifactId>tika-core</artifactId>
-      <version>3.2.3</version>
-    </dependency>
-
-
-    <!-- Testing dependencies -->
-    <dependency>
-      <groupId>org.junit.jupiter</groupId>
-      <artifactId>junit-jupiter-api</artifactId>
-      <version>5.8.2</version>
-      <scope>test</scope>
-    </dependency>
-
-    <dependency>
-      <groupId>org.junit.jupiter</groupId>
-      <artifactId>junit-jupiter-engine</artifactId>
-      <version>5.8.2</version>
-      <scope>test</scope>
-    </dependency>
-
-    <dependency>
-      <groupId>org.junit.platform</groupId>
-      <artifactId>junit-platform-runner</artifactId>
-      <version>1.8.0</version>
-      <scope>test</scope>
-    </dependency>
-
-    <!-- Mocking objects testing dependencies -->
-    <dependency>
-      <groupId>org.mockito</groupId>
-      <artifactId>mockito-core</artifactId>
-      <version>4.11.0</version>
-      <scope>test</scope>
-    </dependency>
-  </dependencies>
-
-  <!-- all of the below is needed for releasing -->
-  <build>
-    <plugins>
-
-      <!-- Maven plugin -->
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-compiler-plugin</artifactId>
-        <version>3.13.0</version>
-        <configuration>
-          <source>${java.version}</source>
-          <target>${java.version}</target>
-        </configuration>
-      </plugin>
-
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-surefire-plugin</artifactId>
-        <version>3.2.5</version>
-        <configuration>
-          <useSystemClassLoader>false</useSystemClassLoader>
-          <forkCount>1</forkCount>
-          <reuseForks>false</reuseForks>
-        </configuration>
-      </plugin>
-
-      <plugin>
-        <groupId>org.apache.maven.plugins</groupId>
-        <artifactId>maven-failsafe-plugin</artifactId>
-        <version>3.2.5</version>
-      </plugin>
-    </plugins>
-
-    <!-- Resources path -->
-    <resources>
-      <resource>
-        <directory>src/main/resources</directory>
-        <filtering>true</filtering>
-      </resource>
-    </resources>
-  </build>
-
-  <!-- mvn deploy -P releaseId
-    first release SNAPSHOT (with name SNAPSHOT in version, then release)
-    -->
 
-  <profiles>
-    <profile>
-      <id>release</id>
+    <developers>
+        <developer>
+            <name>Igor Balos</name>
+            <organization>ActiveCampaign</organization>
+            <organizationUrl>https://www.activecampaign.com</organizationUrl>
+            <url>https://twitter.com/ibalosh/</url>
+            <email>ibalosh@gmail.com</email>
+        </developer>
+    </developers>
+
+    <properties>
+        <postmark.version>1.13.0</postmark.version>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+        <java.version>21</java.version>
+        <jackson.minimum.version>2.9.7</jackson.minimum.version>
+        <jackson.version>2.15.0</jackson.version>
+        <junit.jupiter.version>5.8.2</junit.jupiter.version>
+        <junit.platform.version>1.3.2</junit.platform.version>
+    </properties>
+
+    <licenses>
+        <license>
+            <name>MIT License</name>
+            <url>http://www.opensource.org/licenses/mit-license.php</url>
+            <distribution>repo</distribution>
+        </license>
+    </licenses>
+
+    <scm>
+        <url>https://github.com/activecampaign/postmark-java</url>
+        <connection>scm:git@github.com:ActiveCampaign/postmark-java.git</connection>
+        <developerConnection>scm:git@github.com:ActiveCampaign/postmark-java.git</developerConnection>
+    </scm>
+
+    <dependencies>
+
+        <dependency>
+            <groupId>org.apache.httpcomponents.client5</groupId>
+            <artifactId>httpclient5</artifactId>
+            <version>5.5</version>
+        </dependency>
+
+        <!-- Serialization to JSON -->
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-core</artifactId>
+            <version>2.15.0</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-annotations</artifactId>
+            <version>2.15.0</version>
+        </dependency>
+
+        <dependency>
+            <groupId>com.fasterxml.jackson.core</groupId>
+            <artifactId>jackson-databind</artifactId>
+            <version>2.15.0</version>
+        </dependency>
+
+        <!-- MIME auto detect on files -->
+        <dependency>
+            <groupId>org.apache.tika</groupId>
+            <artifactId>tika-core</artifactId>
+            <version>3.2.3</version>
+        </dependency>
+
+
+        <!-- Testing dependencies -->
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-api</artifactId>
+            <version>5.8.2</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.junit.jupiter</groupId>
+            <artifactId>junit-jupiter-engine</artifactId>
+            <version>5.8.2</version>
+            <scope>test</scope>
+        </dependency>
+
+        <dependency>
+            <groupId>org.junit.platform</groupId>
+            <artifactId>junit-platform-runner</artifactId>
+            <version>1.8.0</version>
+            <scope>test</scope>
+        </dependency>
+
+        <!-- Mocking objects testing dependencies -->
+        <dependency>
+            <groupId>org.mockito</groupId>
+            <artifactId>mockito-core</artifactId>
+            <version>4.110</version>
+            <scope>test</scope>
+        </dependency>
+    </dependencies>
+
+    <!-- all of the below is needed for releasing -->
+    <build>
+        <plugins>
 
-      <activation>
-        <property>
-          <name>performRelease</name>
-        </property>
-      </activation>
+            <!-- Maven plugin -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <version>3.13.0</version>
+                <configuration>
+                    <source>${java.version}</source>
+                    <target>${java.version}</target>
+                </configuration>
+            </plugin>
 
-      <build>
-        <plugins>
-          <!-- Release files to Maven server plugin -->
-          <plugin>
-            <groupId>org.sonatype.plugins</groupId>
-            <artifactId>nexus-staging-maven-plugin</artifactId>
-            <version>1.6.7</version>
-            <extensions>true</extensions>
-            <configuration>
-              <serverId>central</serverId>
-              <nexusUrl>https://ossrh-staging-api.central.sonatype.com/</nexusUrl>
-              <autoReleaseAfterClose>true</autoReleaseAfterClose>
-            </configuration>
-          </plugin>
-
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-source-plugin</artifactId>
-            <version>2.2.1</version>
-            <executions>
-              <execution>
-                <id>attach-sources</id>
-                <goals>
-                  <goal>jar-no-fork</goal>
-                </goals>
-              </execution>
-            </executions>
-          </plugin>
-
-          <!-- generate javadocs -->
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-javadoc-plugin</artifactId>
-            <version>3.6.3</version>
-            <executions>
-              <execution>
-                <id>attach-javadocs</id>
-                <goals>
-                  <goal>jar</goal>
-                </goals>
-              </execution>
-            </executions>
-          </plugin>
-
-          <!-- Signing files for release plugin -->
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-gpg-plugin</artifactId>
-            <version>1.6</version>
-            <executions>
-              <execution>
-                <id>sign-artifacts</id>
-                <phase>verify</phase>
-                <goals>
-                  <goal>sign</goal>
-                </goals>
-              </execution>
-            </executions>
-          </plugin>
-          <!-- Maven dependency enforcer plugin -->
-          <plugin>
-            <groupId>org.apache.maven.plugins</groupId>
-            <artifactId>maven-enforcer-plugin</artifactId>
-            <version>3.0.0-M2</version>
-
-            <executions>
-              <execution>
-                <id>enforce-banned-dependencies</id>
-                <goals>
-                  <goal>enforce</goal>
-                </goals>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-surefire-plugin</artifactId>
+                <version>3.2.5</version>
                 <configuration>
-                  <rules>
-                    <bannedDependencies>
-                      <searchTransitive>true</searchTransitive>
-                      <excludes>
-                        <exclude>
-                          com.fasterxml.jackson.core:jackson-annotations:(,${jackson.minimum.version}]</exclude>
-                        <exclude>
-                          com.fasterxml.jackson.core:jackson-core:jar:(,${jackson.minimum.version}]</exclude>
-                        <exclude>
-                          com.fasterxml.jackson.core:jackson-databind:jar:(,${jackson.minimum.version}]</exclude>
-                      </excludes>
-                      <message>A banned dependency was found! Need to use jackson newer than
-                        ${jackson.minimum.version}.</message>
-                    </bannedDependencies>
-                  </rules>
-                  <fail>true</fail>
+                    <useSystemClassLoader>false</useSystemClassLoader>
+                    <forkCount>1</forkCount>
+                    <reuseForks>false</reuseForks>
                 </configuration>
-              </execution>
-            </executions>
-          </plugin>
+            </plugin>
 
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-failsafe-plugin</artifactId>
+                <version>3.2.5</version>
+            </plugin>
         </plugins>
-      </build>
-
-      <!-- Maven deploy repository setting -->
-      <distributionManagement>
-        <snapshotRepository>
-          <id>central</id>
-          <url>https://central.sonatype.com/repository/maven-snapshots/</url>
-        </snapshotRepository>
-        <repository>
-          <id>central</id>
-          <url>https://ossrh-staging-api.central.sonatype.com/service/local/staging/deploy/maven2/</url>
-        </repository>
-      </distributionManagement>
 
+        <!-- Resources path -->
+        <resources>
+            <resource>
+                <directory>src/main/resources</directory>
+                <filtering>true</filtering>
+            </resource>
+        </resources>
+    </build>
 
-    </profile>
-  </profiles>
+    <!-- mvn deploy -P releaseId
+    first release SNAPSHOT (with name SNAPSHOT in version, then release)
+    -->
 
-</project>
+    <profiles>
+        <profile>
+            <id>release</id>
+
+            <activation>
+                <property>
+                    <name>performRelease</name>
+                </property>
+            </activation>
+
+            <build>
+            <plugins>
+                <!-- Release files to Maven server plugin -->
+                <plugin>
+                    <groupId>org.sonatype.plugins</groupId>
+                    <artifactId>nexus-staging-maven-plugin</artifactId>
+                    <version>1.6.7</version>
+                    <extensions>true</extensions>
+                    <configuration>
+                        <serverId>central</serverId>
+                        <nexusUrl>https://ossrh-staging-api.central.sonatype.com/</nexusUrl>
+                        <autoReleaseAfterClose>true</autoReleaseAfterClose>
+                    </configuration>
+                </plugin>
+
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-source-plugin</artifactId>
+                    <version>2.2.1</version>
+                    <executions>
+                        <execution>
+                            <id>attach-sources</id>
+                            <goals>
+                                <goal>jar-no-fork</goal>
+                            </goals>
+                        </execution>
+                    </executions>
+                </plugin>
+
+                <!-- generate javadocs -->
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-javadoc-plugin</artifactId>
+                    <version>3.6.3</version>
+                    <executions>
+                        <execution>
+                            <id>attach-javadocs</id>
+                            <goals>
+                                <goal>jar</goal>
+                            </goals>
+                        </execution>
+                    </executions>
+                </plugin>
+
+                <!-- Signing files for release plugin -->
+                <plugin>
+                    <groupId>org.apache.maven.plugins</groupId>
+                    <artifactId>maven-gpg-plugin</artifactId>
+                    <version>1.6</version>
+                    <executions>
+                        <execution>
+                            <id>sign-artifacts</id>
+                            <phase>verify</phase>
+                            <goals>
+                                <goal>sign</goal>
+                            </goals>
+                        </execution>
+                    </executions>
+                </plugin>
+            <!-- Maven dependency enforcer plugin -->
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-enforcer-plugin</artifactId>
+                <version>3.0.0-M2</version>
+
+                <executions>
+                    <execution>
+                        <id>enforce-banned-dependencies</id>
+                        <goals>
+                            <goal>enforce</goal>
+                        </goals>
+                        <configuration>
+                            <rules>
+                                <bannedDependencies>
+                                    <searchTransitive>true</searchTransitive>
+                                    <excludes>
+                                        <exclude>
+                                          com.fasterxml.jackson.core:jackson-annotations:(,${jackson.minimum.version}]</exclude>
+                                        <exclude>
+                                          com.fasterxml.jackson.core:jackson-core:jar:(,${jackson.minimum.version}]</exclude>
+                                        <exclude>
+                                          com.fasterxml.jackson.core:jackson-databind:jar:(,${jackson.minimum.version}]</exclude>
+                                    </excludes>
+                                    <message>A banned dependency was found! Need to use jackson newer than 
+                                      ${jackson.minimum.version}.</message>
+                                </bannedDependencies>
+                            </rules>
+                            <fail>true</fail>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+
+            </plugins>
+            </build>
+
+            <!-- Maven deploy repository setting -->
+            <distributionManagement>
+                <snapshotRepository>
+                    <id>central</id>
+                    <url>https://central.sonatype.com/repository/maven-snapshots/</url>
+                </snapshotRepository>
+                <repository>
+                    <id>central</id>
+                    <url>https://ossrh-staging-api.central.sonatype.com/service/local/staging/deploy/maven2/</url>
+                </repository>
+            </distributionManagement>
+
+
+        </profile>
+    </profiles>
+
+</project>
\ No newline at end of file

From 43ff496c0ffcff5fd9b79dd36ee0985bcf9853d2 Mon Sep 17 00:00:00 2001
From: "Wakefield-Olson, Allan M." <amwakefield-olson@fedins.com>
Date: Wed, 25 Mar 2026 11:37:13 -0500
Subject: [PATCH 3/4] Refactor banned dependencies section in pom.xml for
 improved readability

---
 pom.xml | 12 ++++--------
 1 file changed, 4 insertions(+), 8 deletions(-)

diff --git a/pom.xml b/pom.xml
index 47b645a..de901ce 100644
--- a/pom.xml
+++ b/pom.xml
@@ -244,15 +244,11 @@
                                 <bannedDependencies>
                                     <searchTransitive>true</searchTransitive>
                                     <excludes>
-                                        <exclude>
-                                          com.fasterxml.jackson.core:jackson-annotations:(,${jackson.minimum.version}]</exclude>
-                                        <exclude>
-                                          com.fasterxml.jackson.core:jackson-core:jar:(,${jackson.minimum.version}]</exclude>
-                                        <exclude>
-                                          com.fasterxml.jackson.core:jackson-databind:jar:(,${jackson.minimum.version}]</exclude>
+                                        <exclude>com.fasterxml.jackson.core:jackson-annotations:(,${jackson.minimum.version}]</exclude>
+                                        <exclude>com.fasterxml.jackson.core:jackson-core:jar:(,${jackson.minimum.version}]</exclude>
+                                        <exclude>com.fasterxml.jackson.core:jackson-databind:jar:(,${jackson.minimum.version}]</exclude>
                                     </excludes>
-                                    <message>A banned dependency was found! Need to use jackson newer than 
-                                      ${jackson.minimum.version}.</message>
+                                    <message>A banned dependency was found! Need to use jackson newer than ${jackson.minimum.version}.</message>
                                 </bannedDependencies>
                             </rules>
                             <fail>true</fail>

From 860b3da5457472a4dacc8dc786998a036bf04939 Mon Sep 17 00:00:00 2001
From: "Wakefield-Olson, Allan M." <amwakefield-olson@fedins.com>
Date: Wed, 25 Mar 2026 11:57:28 -0500
Subject: [PATCH 4/4] Update README.md to emphasize Java 21 requirement for
 version 2.0.0

---
 README.md | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/README.md b/README.md
index 45f80da..8f306d6 100644
--- a/README.md
+++ b/README.md
@@ -7,6 +7,8 @@
 [![License](http://img.shields.io/badge/license-MIT-blue.svg?style=flat)](http://www.opensource.org/licenses/MIT)
 [![Maven Central](https://maven-badges.herokuapp.com/maven-central/com.postmarkapp/postmark/badge.svg)](https://maven-badges.herokuapp.com/maven-central/com.postmarkapp/postmark)
 
+:star: :star: **IMPORTANT UPDATE:** :star: :star: As of version 2.0.0, this library requires Java 21. Please ensure your runtime is Java 21 or newer.
+
 :star: :star: **IMPORTANT UPDATE** :star: :star: **As of version 1.9.0, we migrated from groupid ```com.wildbit.java``` to ```com.postmarkapp```.**
 Please update your pom.xml file with new groupid and your imports to use the latest versions of the library.