(Node.js) Fetch Oldest/Newest IMAP Email

Emails may be downloaded by sequence number. Assuming the selected mailbox is not empty, the oldest email is at sequence number 1, and the newest email is at sequence number N. The FetchSingle method may be used to download by sequence number.

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 assumes 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("mail.testemail.net");
    if (success !== true) {
        console.log(imap.LastErrorText);
        return;
    }

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

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

    // After selecting a mailbox, the NumMessages property
    // contains the number of emails in the selected mailbox.
    var n;
    n = imap.NumMessages;

    if (n > 0) {

        // The oldest email is always at sequence number 1.
        var isUid = false;

        // oldestEmail: Email
        var oldestEmail;
        oldestEmail = imap.FetchSingle(1,isUid);
        if (imap.LastMethodSuccess == true) {

            // Display the From and Subject
            console.log(oldestEmail.FromAddress);
            console.log(oldestEmail.Subject);

            console.log("--");

        }

        // The newest email is at sequence number N:
        // newestEmail: Email
        var newestEmail;
        newestEmail = imap.FetchSingle(n,isUid);
        if (imap.LastMethodSuccess == true) {

            // Display the From and Subject
            console.log(newestEmail.FromAddress);
            console.log(newestEmail.Subject);

        }

    }

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

}

chilkatExample();