(Node.js) Move Selected Emails to another Mailbox Folder

Downloads emails one by one in a selected mailbox, decides which emails are to be moved, and then moves the set of messages to another mailbox folder.

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 imap = new chilkat.Imap();

    // Connect to an IMAP server.
    // Use TLS
    imap.Ssl = true;
    imap.Port = 993;
    var success = imap.Connect("imap.someMailServer.com");
    if (success !== true) {
        console.log(imap.LastErrorText);
        return;
    }

    // Login
    success = imap.Login("myLogin","myPassword");
    if (success !== true) {
        console.log(imap.LastErrorText);
        return;
    }

    // Select an IMAP mailbox
    success = imap.SelectMailbox("Inbox");
    if (success !== true) {
        console.log(imap.LastErrorText);
        return;
    }

    // Normally, when an email is downloaded, its "Seen" flag is automatically set.
    // We don't want our program to be interfering with the "Seen" flags.
    // To do this, set the PeekMode to true.
    imap.PeekMode = true;

    // After selecting the mailbox, the NumMessages property
    // will contain the number of emails in the mailbox.
    // When sequence numbers (not UIDs) are used to reference emails,
    // they range from 1 to N, where N is the number of messages in the mailbox.
    // This example will download the headers by sequence numbers.
    var numEmails = imap.NumMessages;

    var mset = new chilkat.MessageSet();

    // Indicate that mset contains sequence numbers, not UIDs.
    mset.HasUids = false;

    // Fetch each email and decide for each if it is to be moved
    // to a particular other mailbox.  If so, we'll add the sequence number to
    // the mset, and then move all emails in the mset to the other mailbox.
    var i = 0;
    while (i < numEmails) {
        // Fetch the email by sequence number.
        // email: Email
        var email = imap.FetchSingle(i+1,false);
        if (imap.LastMethodSuccess !== true) {
            console.log(imap.LastErrorText);
            return;
        }

        // If it is decided to move the email, add the sequence number to mset, like this:
        mset.InsertId(i+1);

    }

    // If there are emails in mset to be moved, then do it..
    if (mset.Count > 0) {
        var destFolder = "Inbox/SomeOtherFolder";
        // Assuming your IMAP server supports the feature that allows for messages to be moved to another folder...
        success = imap.MoveMessages(mset,destFolder);
        if (success !== true) {
            console.log(imap.LastErrorText);
            return;
        }

    }

    // Disconnect from the IMAP server.
    success = imap.Disconnect();

}

chilkatExample();