Java

SMTP Inspection

See more SMTP Examples

Examine an SMTP session to view all communications sent to the SMTP server. Java

import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    CkMailMan mailman = new CkMailMan();

    mailman.put_SmtpHost("smtp.example.com");
    mailman.put_SmtpUsername("myUsername");
    mailman.put_SmtpPassword("myPassword");

    mailman.put_SmtpPort(465);
    mailman.put_StartTLS(true);

    CkEmail email = new CkEmail();

    email.put_Subject("This is a test");
    email.put_Body("This is a test");
    email.put_From("Alex <alex@example.com>");
    email.AddTo("Christoph","christoph@example2.com");
    email.AddBcc("Victor","victor@example3.com");

    //  Generate the MIME that is sent when SendEmail is called
    String mimeStr = mailman.renderToMime(email);
    System.out.println(mimeStr);

    success = mailman.SendEmail(email);
    if (success == false) {
        System.out.println(mailman.lastErrorText());
        return;
        }

    success = mailman.CloseSmtpConnection();
    if (success != true) {
        System.out.println("Connection to SMTP server not closed cleanly.");
        }

    //  Examine the SMTP session log.
    System.out.println("----");
    System.out.println("Smtp Session Log:");
    System.out.println(mailman.smtpSessionLog());

    //  ---------------------------------------------------
    //  Sample output:
    //  ---------------------------------------------------

    //  MIME-Version: 1.0
    //  Date: Fri, 06 Mar 2026 16:21:00 -0600
    //  Message-ID: <A5DC25990C93EC2676F4FBB2BB3BFA9EB34FF9D3@CHILKAT25>
    //  Content-Type: text/plain; charset=us-ascii; format=flowed
    //  Content-Transfer-Encoding: 7bit
    //  X-Priority: 3 (Normal)
    //  Subject: This is a test
    //  From: Alex <alex@example.com>
    //  To: Christoph <christoph@example2.com>
    //  Bcc: Victor <victor@example3.com>
    //  
    //  This is a test
    //  ----
    //  Smtp Session Log:
    //  220 smtp.example.com ESMTP Amazon WorkMail SMTP Service
    //  EHLO MYCOMPUTER<CRLF>
    //  250-smtp.example.com
    //  250-8BITMIME
    //  250-AUTH PLAIN LOGIN
    //  250 Ok
    //  AUTH LOGIN<CRLF>
    //  334 VXNlcm5hbWU6
    //  YWRtaW5AY2hpbGthdHNvZnQuY29t<CRLF>
    //  334 UGFzc3dvcmQ6
    //  {PasswordOrCredentials}
    //  235 Authentication successful.
    //  MAIL FROM:<alex@example.com><CRLF>
    //  250 Ok
    //  RCPT TO:<christoph@example2.com><CRLF>
    //  250 Ok
    //  RCPT TO:<victor@example3.com><CRLF>
    //  250 Ok
    //  DATA<CRLF>
    //  354 End data with <CR><LF>.<CR><LF>
    //  {388 bytes} <--- The MIME source of the email (examined via RenderToMime) was sent here.
    //  <CRLF>.<CRLF>
    //  250 Ok
    //  QUIT<CRLF>
    //  221 Bye
  }
}