eugenp · saajn · Jul 22, 2025 · Jul 19, 2025 · Jul 19, 2025 · Jul 19, 2025
diff --git a/core-java-modules/core-java-networking-6/pom.xml b/core-java-modules/core-java-networking-6/pom.xml
@@ -14,16 +14,6 @@
     </parent>
 
     <dependencies>
-        <dependency>
-            <groupId>org.springframework</groupId>
-            <artifactId>spring-web</artifactId>
-            <version>${springframework.spring-web.version}</version>
-        </dependency>
-        <dependency>
-            <groupId>org.springframework.boot</groupId>
-            <artifactId>spring-boot-starter-web</artifactId>
-            <version>${webflux.version}</version>
-        </dependency>
         <dependency>
             <groupId>org.springframework.boot</groupId>
             <artifactId>spring-boot-starter-webflux</artifactId>
@@ -44,11 +34,6 @@
             <artifactId>async-http-client</artifactId>
             <version>${async-http-client.version}</version>
         </dependency>
-        <dependency>
-            <groupId>org.apache.commons</groupId>
-            <artifactId>commons-lang3</artifactId>
-            <version>${commons-lang3.version}</version>
-        </dependency>
         <dependency>
             <groupId>com.squareup.okhttp3</groupId>
             <artifactId>okhttp</artifactId>
@@ -65,6 +50,16 @@
             <artifactId>commons-net</artifactId>
             <version>${commons-net.version}</version>
         </dependency>
+        <dependency>
+            <groupId>org.eclipse.angus</groupId>
+            <artifactId>angus-mail</artifactId>
+            <version>${angus-mail.version}</version>
+        </dependency>
+        <dependency>
+            <groupId>com.icegreen</groupId>
+            <artifactId>greenmail</artifactId>
+            <version>${greenmail.version}</version>
+        </dependency>
         <dependency>
             <groupId>org.wiremock</groupId>
             <artifactId>wiremock</artifactId>
@@ -75,19 +70,29 @@
 
     <build>
         <finalName>core-java-networking-6</finalName>
+        <plugins>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-compiler-plugin</artifactId>
+                <configuration>
+                    <source>21</source>
+                    <target>21</target>
+                </configuration>
+            </plugin>
+        </plugins>
     </build>
 
     <properties>
-        <springframework.spring-web.version>4.3.4.RELEASE</springframework.spring-web.version>
         <apache.httpclient.version>4.5.14</apache.httpclient.version>
-        <greenmail.version>2.0.0-alpha-3</greenmail.version>
         <apache.httpclient5.version>5.3.1</apache.httpclient5.version>
         <async-http-client.version>2.4.5</async-http-client.version>
         <jakarta.bind.version>2.3.3</jakarta.bind.version>
         <apache.httpclient5.version>5.4.2</apache.httpclient5.version>
         <okhttp.version>4.12.0</okhttp.version>
         <webflux.version>3.4.3</webflux.version>
         <commons-net.version>3.8.0</commons-net.version>
+        <angus-mail.version>2.0.3</angus-mail.version>
+        <greenmail.version>2.1.3</greenmail.version>
         <wiremock.version>3.13.0</wiremock.version>
     </properties>
 

diff --git a/...es/core-java-networking-6/src/main/java/com/baeldung/inlineimagesinemail/InlineImage.java b/...es/core-java-networking-6/src/main/java/com/baeldung/inlineimagesinemail/InlineImage.java
@@ -0,0 +1,101 @@
+package com.baeldung.inlineimagesinemail;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.Properties;
+
+import jakarta.mail.Authenticator;
+import jakarta.mail.Message;
+import jakarta.mail.MessagingException;
+import jakarta.mail.PasswordAuthentication;
+import jakarta.mail.Session;
+import jakarta.mail.Transport;
+import jakarta.mail.internet.InternetAddress;
+import jakarta.mail.internet.MimeBodyPart;
+import jakarta.mail.internet.MimeMessage;
+import jakarta.mail.internet.MimeMultipart;
+
+import com.icegreen.greenmail.util.GreenMail;
+
+public class InlineImage {
+
+    private final String USERNAME = "YOUR_SMTP_USERNAME";
+    private final String PASSWORD = "YOUR_SMTP_PASSWORD";
+    private final String HOST = "SMTP HOST";
+    private final String PORT = "SMTP PORT";
+
+    public Properties smtpProperties() {
+        Properties prop = new Properties();
+        prop.put("mail.smtp.auth", "true");
+        prop.put("mail.smtp.starttls.enable", "true");
+        prop.put("mail.smtp.host", HOST);
+        prop.put("mail.smtp.port", PORT);
+        prop.put("mail.smtp.user", USERNAME);
+        prop.put("mail.smtp.password", PASSWORD);
+
+        return prop;
+    }
+
+    public Session smtpsession(Properties props) {
+        final String username = props.getProperty("mail.smtp.user");
+        final String password = props.getProperty("mail.smtp.password");
+
+        Session session = Session.getInstance(props, new Authenticator() {
+            @Override
+            protected PasswordAuthentication getPasswordAuthentication() {
+                return new PasswordAuthentication(username, password);
+            }
+        });
+
+        return session;
+    }
+
+    public Session smtpsession(GreenMail greenMail) {
+
+        Session session = greenMail.getSmtp()
+            .createSession();
+
+        return session;
+    }
+
+    public void sendEmail(Session session, String to, String subject, String body, String filePath) throws MessagingException, IOException {
+
+        MimeMessage message = new MimeMessage(session);
+        message.setFrom(new InternetAddress("example@gmail.com"));
+        message.setRecipients(Message.RecipientType.TO, InternetAddress.parse(to));
+        message.setSubject(subject);
+
+        MimeBodyPart htmlPart = new MimeBodyPart();
+        htmlPart.setContent(body, "text/html");
+
+        MimeBodyPart imagePart = new MimeBodyPart();
+        imagePart.attachFile(new File(filePath));
+        imagePart.setContentID("<image1>");
+        imagePart.setDisposition(MimeBodyPart.INLINE);
+
+        MimeMultipart mimeMultipart = new MimeMultipart("related");
+        mimeMultipart.addBodyPart(htmlPart);
+        mimeMultipart.addBodyPart(imagePart);
+
+        message.setContent(mimeMultipart);
+
+        Transport.send(message);
+    }
+
+    public static void main(String[] args) throws MessagingException, IOException {
+        InlineImage inlineImage = new InlineImage();
+        Properties properties = inlineImage.smtpProperties();
+        Session session = inlineImage.smtpsession(properties);
+
+        String to = "receiver@gmail.com";
+        String subject = "Baeldung";
+        String body = """
+             <p>Welcome to Baeldung, home of Java and its frameworks.</p>
+             <img src='cid:image1'></img>
+             <p> Explore and learn. </p>
+            """;
+        String imagePath = "src/main/resources/image/java.png";
+
+        inlineImage.sendEmail(session, to, subject, body, imagePath);
+    }
+}
diff --git a/core-java-modules/core-java-networking-6/src/main/resources/image/java.png b/core-java-modules/core-java-networking-6/src/main/resources/image/java.png
diff --git a/...java-networking-6/src/test/java/com/baeldung/inlineimagesinemail/InlineImageUnitTest.java b/...java-networking-6/src/test/java/com/baeldung/inlineimagesinemail/InlineImageUnitTest.java
@@ -0,0 +1,59 @@
+package com.baeldung.inlineimagesinemail;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+import static org.junit.jupiter.api.Assertions.assertTrue;
+
+import jakarta.mail.BodyPart;
+import jakarta.mail.Multipart;
+import jakarta.mail.Part;
+import jakarta.mail.Session;
+import jakarta.mail.internet.MimeMessage;
+
+import org.junit.jupiter.api.Test;
+
+import com.icegreen.greenmail.util.GreenMail;
+import com.icegreen.greenmail.util.ServerSetupTest;
+
+class InlineImageUnitTest {
+
+    @Test
+    void givenHtmlEmailWithInlineImage_whenSentViaGreenMailSmtp_thenReceivesEmailWithInlineImage() throws Exception {
+        GreenMail greenMail = new GreenMail(ServerSetupTest.SMTP);
+        greenMail.start();
+        InlineImage inlineImage = new InlineImage();
+        Session session = inlineImage.smtpsession(greenMail);
+
+        String to = "receiver@localhost";
+        String subject = "Test Subject";
+        String body = """
+             <p>Welcome to Baeldung, home of Java and its frameworks.</p>
+             <img src='cid:image1'></img>
+             <p> Explore and learn. </p>
+            """;
+        String imagePath = "src/main/resources/image/java.png";
+
+        inlineImage.sendEmail(session, to, subject, body, imagePath);
+
+        MimeMessage[] receivedMessages = greenMail.getReceivedMessages();
+        assertEquals(1, receivedMessages.length);
+
+        MimeMessage message = receivedMessages[0];
+
+        Multipart multipart = (Multipart) message.getContent();
+        assertEquals(2, multipart.getCount());
+
+        BodyPart htmlPart = multipart.getBodyPart(0);
+        assertTrue(htmlPart.getContentType()
+            .contains("text/html"));
+        String htmlContent = (String) htmlPart.getContent();
+        assertTrue(htmlContent.contains("cid:image1"));
+
+        BodyPart imagePart = multipart.getBodyPart(1);
+        String contentId = imagePart.getHeader("Content-ID")[0];
+        assertTrue(contentId.contains("image1") || contentId.contains("<image1>"));
+
+        assertEquals(Part.INLINE, imagePart.getDisposition());
+        greenMail.stop();
+    }
+
+}