POP3 to SMTP Forwarder

Read a POP3 mailbox and forwards the email to another email address, keeping the recipients in the original email the same.

Download Chilkat Java Library

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[])
  {
    //  The mailman object is used for receiving (POP3)
    //  and sending (SMTP) email.
    CkMailMan mailman = new CkMailMan();

    //  Any string argument automatically begins the 30-day trial.
    boolean success;
    success = mailman.UnlockComponent("30-day trial");
    if (success != true) {
        System.out.println("Component unlock failed");
        return;
    }

    //  Set the POP3 server's hostname
    mailman.put_MailHost("mail.chilkatsoft.com");

    //  Set the POP3 login/password.
    mailman.put_PopUsername("matt@chilkatsoft.com");
    mailman.put_PopPassword("****");

    CkStringArray saUidls;

    //  The the UIDLs for all email in the POP3 mailbox.
    saUidls = mailman.GetUidls();
    if (saUidls == null ) {
        System.out.println(mailman.lastErrorText());
        return;
    }

    CkStringArray saMime;

    //  Download the email from the server.  Call FetchMultipleMime
    //  because we don't want to load the emails into email objects.
    //  (We'll delete the emails that are forwarded without error.)
    saMime = mailman.FetchMultipleMime(saUidls);

    if (saMime == null ) {

        System.out.println(mailman.lastErrorText());
        return;
    }

    //  Set the SMTP hostname for sending.
    mailman.put_SmtpHost("mail.chilkatsoft.com");
    mailman.put_SmtpUsername("admin@chilkatsoft.com");
    mailman.put_SmtpPassword("****");

    int i;
    String strMime;
    int n;
    n = (int) saMime.get_Count();

    String fromAddr;
    String toAddr;
    fromAddr = "matt@chilkatsoft.com";
    toAddr = "admin@chilkatsoft.com";

    boolean bAllOk;
    bAllOk = true;

    if (n > 0) {
        for (i = 0; i <= n - 1; i++) {

            strMime = saMime.getString(i);

            //  Forward the email.
            success = mailman.SendMime(fromAddr,toAddr,strMime);
            if (success != true) {
                bAllOk = false;
                System.out.println(mailman.lastErrorText());
                break;
            }

        }

    }

    //  Remove the emails in saUidls from the POP3 server.
    if (bAllOk == true) {
        success = mailman.DeleteMultiple(saUidls);
        if (success != true) {
            System.out.println(mailman.lastErrorText());
        }

    }


  }
}