(Java) Copy Email from one IMAP Account to Another

Demonstrates how to copy the email in a mailbox from one account to another.

Chilkat Java Downloads Java Libs for Windows, MacOS, Linux, Alpine Linux, Solaris Java Libs for Android

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[])
  {
    CkImap imapSrc = new CkImap();

    // This example assumes Chilkat Imap to have been previously unlocked.
    // See Unlock Imap for sample code.

    // Connect to our source IMAP server.
    imapSrc.put_Ssl(true);
    imapSrc.put_Port(993);
    boolean success = imapSrc.Connect("MY-IMAP-DOMAIN");
    if (success != true) {
        System.out.println(imapSrc.lastErrorText());
        return;
        }

    // Login to the source IMAP server
    success = imapSrc.Login("MY-IMAP-LOGIN","MY-IMAP-PASSWORD");
    if (success != true) {
        System.out.println(imapSrc.lastErrorText());
        return;
        }

    CkImap imapDest = new CkImap();

    // Connect to our destination IMAP server.
    imapDest.put_Ssl(true);
    imapDest.put_Port(993);
    success = imapDest.Connect("MY-IMAP-DOMAIN2");
    if (success != true) {
        System.out.println(imapDest.lastErrorText());
        return;
        }

    // Login to the destination IMAP server
    success = imapDest.Login("MY-IMAP-LOGIN2","MY-IMAP-PASSWORD2");
    if (success != true) {
        System.out.println(imapDest.lastErrorText());
        return;
        }

    // Select a source IMAP mailbox on the source IMAP server
    success = imapSrc.SelectMailbox("Inbox");
    if (success != true) {
        System.out.println(imapSrc.lastErrorText());
        return;
        }

    boolean fetchUids = true;

    // Get the set of UIDs for all emails on the source server.
    CkMessageSet mset = imapSrc.Search("ALL",fetchUids);
    if (imapSrc.get_LastMethodSuccess() != true) {
        System.out.println(imapSrc.lastErrorText());
        return;
        }

    // Load the complete set of UIDs that were previously copied.
    // We dont' want to copy any of these to the destination.
    CkFileAccess fac = new CkFileAccess();
    CkMessageSet msetAlreadyCopied = new CkMessageSet();
    String strMsgSet = fac.readEntireTextFile("qa_cache/saAlreadyLoaded.txt","utf-8");
    if (fac.get_LastMethodSuccess() == true) {
        msetAlreadyCopied.FromCompactString(strMsgSet);
        }

    int numUids = mset.get_Count();
    CkStringBuilder sbFlags = new CkStringBuilder();

    int i = 0;
    while (i < numUids) {

        // If this UID was not already copied...
        int uid = mset.GetId(i);
        if (!msetAlreadyCopied.ContainsId(uid)) {

            System.out.println("copying " + uid + "...");

            // Get the flags.
            String flags = imapSrc.fetchFlags(uid,true);
            if (imapSrc.get_LastMethodSuccess() == false) {
                System.out.println(imapSrc.lastErrorText());
                return;
                }

            sbFlags.SetString(flags);

            // Get the MIME of this email from the source.
            String mimeStr = imapSrc.fetchSingleAsMime(uid,true);
            if (imapSrc.get_LastMethodSuccess() == false) {
                System.out.println(imapSrc.lastErrorText());
                return;
                }

            boolean seen = sbFlags.Contains("\\Seen",false);
            boolean flagged = sbFlags.Contains("\\Flagged",false);
            boolean answered = sbFlags.Contains("\\Answered",false);
            boolean draft = sbFlags.Contains("\\Draft",false);

            success = imapDest.AppendMimeWithFlags("Inbox",mimeStr,seen,flagged,answered,draft);
            if (success != true) {
                System.out.println(imapDest.lastErrorText());
                return;
                }

            // Update msetAlreadyCopied with the uid just copied.
            msetAlreadyCopied.InsertId(uid);

            // Save at every iteration just in case there's a failure..
            strMsgSet = msetAlreadyCopied.toCompactString();
            fac.WriteEntireTextFile("qa_cache/saAlreadyLoaded.txt",strMsgSet,"utf-8",false);
            }

        i = i+1;
        }

    // Disconnect from the IMAP servers.
    success = imapSrc.Disconnect();
    success = imapDest.Disconnect();
  }
}