(Node.js) How to Copy IMAP Mail to another IMAP Server

Demonstrates how to copy the entire contents of an IMAP mailbox to another IMAP server.

Install Chilkat for Node.js and Electron using npm at Chilkat npm packages for Node.js Chilkat npm packages for Electron on Windows, Linux, MacOSX, and ARM

var os = require('os');
if (os.platform() == 'win32') {  
    if (os.arch() == 'ia32') {
        var chilkat = require('@chilkat/ck-node21-win-ia32');
    } else {
        var chilkat = require('@chilkat/ck-node21-win64'); 
    }
} else if (os.platform() == 'linux') {
    if (os.arch() == 'arm') {
        var chilkat = require('@chilkat/ck-node21-arm');
    } else if (os.arch() == 'x86') {
        var chilkat = require('@chilkat/ck-node21-linux32');
    } else {
        var chilkat = require('@chilkat/ck-node21-linux64');
    }
} else if (os.platform() == 'darwin') {
    if (os.arch() == 'arm64') {
        var chilkat = require('@chilkat/ck-node21-mac-m1');
    } else {
        var chilkat = require('@chilkat/ck-node21-macosx');
    }
}

function chilkatExample() {

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    var imapSrc = new chilkat.Imap();

    // Connect to our source IMAP server.
    var success = imapSrc.Connect("imap.someMailServer.com");
    if (success !== true) {
        console.log(imapSrc.LastErrorText);
        return;
    }

    // Login to the source IMAP server
    success = imapSrc.Login("admin@chilkatsoft.com","myPassword");
    if (success !== true) {
        console.log(imapSrc.LastErrorText);
        return;
    }

    var imapDest = new chilkat.Imap();

    // Connect to our destination IMAP server.
    success = imapDest.Connect("mail.example-code.com");
    if (success !== true) {
        console.log(imapDest.LastErrorText);
        return;
    }

    // Login to the destination IMAP server
    success = imapDest.Login("myLogin","myPassword");
    if (success !== true) {
        console.log(imapDest.LastErrorText);
        return;
    }

    // Select an IMAP mailbox on the source IMAP server
    success = imapSrc.SelectMailbox("Inbox");
    if (success !== true) {
        console.log(imapSrc.LastErrorText);
        return;
    }

    // After selecting a mailbox, the NumMessages property will
    // be updated to reflect the total number of emails in the mailbox:
    console.log(imapSrc.NumMessages);

    // The emails in the mailbox will always have sequence numbers
    // ranging from 1 to NumMessages.

    // This example will copy the first 10 messages.
    // We'll leave it up to you to write code to copy
    // the entire sequence range in reasonable size chunks.
    var startSeqNum = 1;
    var msgCount = 10;

    // sa: StringArray
    var sa;
    sa = imapSrc.FetchSequenceAsMime(startSeqNum,msgCount);
    if (imapSrc.LastMethodSuccess !== true) {
        console.log(imapSrc.LastErrorText);
        return;
    }

    var i;
    for (i = 0; i <= sa.Count - 1; i++) {
        success = imapDest.AppendMime("Inbox",sa.GetString(i));
        if (success !== true) {
            console.log(imapDest.LastErrorText);
            return;
        }

    }

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

}

chilkatExample();