(Node.js) Bounced Email Handling

Demonstrates how to examine emails and detect which are bounced (automated) replies. Classifies each email according to the type of bounce.

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 bounce = new chilkat.Bounce();

    // The mailman object is used for receiving (POP3) 
    // and sending (SMTP) email.
    var mailman = new chilkat.MailMan();

    // Set the POP3 server's hostname
    mailman.MailHost = "mail.chilkatsoft.com";

    // Set the POP3 login/password.
    mailman.PopUsername = "myLogin";
    mailman.PopPassword = "myPassword";

    // Copy the all email from the user's POP3 mailbox 
    // into a bundle object.  The email remains on the server.
    // (There are other methods for deleting email from a POP3 server.)
    // bundle: EmailBundle
    var bundle = mailman.CopyMail();
    if (mailman.LastMethodSuccess == false) {
        console.log(mailman.LastErrorText);
        return;
    }

    var i = 0;
    // email: Email
    var email;
    while (i < bundle.MessageCount) {
        email = bundle.GetEmail(i);

        var success = bounce.ExamineEmail(email);
        if (success == false) {
            console.log(bounce.LastErrorText);

            return;
        }

        if (bounce.BounceType == 1) {
            // Hard bounce, log the email address
            console.log("Hard Bounce: " + bounce.BounceAddress);
        }

        if (bounce.BounceType == 2) {
            // Soft bounce, log the email address
            console.log("Soft Bounce: " + bounce.BounceAddress);
        }

        if (bounce.BounceType == 3) {
            // General bounce, no email address available.
            console.log("General Bounce: No email address");
        }

        if (bounce.BounceType == 4) {
            // General bounce, log the email address
            console.log("General Bounce: " + bounce.BounceAddress);
        }

        if (bounce.BounceType == 5) {
            // Mail blocked, log the email address
            // A bounce occured because the sender was blocked. 
            console.log("Mail Blocked: " + bounce.BounceAddress);
        }

        if (bounce.BounceType == 6) {
            // Auto-reply, log the email address
            console.log("Auto-Reply: " + bounce.BounceAddress);
        }

        if (bounce.BounceType == 7) {
            // Transient (recoverable) Failure, log the email address
            console.log("Transient Failure: " + bounce.BounceAddress);
        }

        if (bounce.BounceType == 8) {
            // Subscribe request, log the email address
            console.log("Subscribe Request: " + bounce.BounceAddress);
        }

        if (bounce.BounceType == 9) {
            // Unsubscribe Request, log the email address
            console.log("Unsubscribe Request: " + bounce.BounceAddress);
        }

        if (bounce.BounceType == 10) {
            // Virus Notification, log the email address
            console.log("Virus Notification: " + bounce.BounceAddress);
        }

        if (bounce.BounceType == 11) {
            // Suspected bounce.
            // This should be rare.  It indicates that the Bounce
            // component found strong evidence that this is a bounced
            // email, but couldn't quite recognize everything it
            // needed to be 100% sure.  Feel free to notify
            // support@chilkatsoft.com regarding emails having this
            // bounce type.
            console.log("Suspected Bounce!");
        }

        if (bounce.BounceType == 12) {
            // Challenge/Response - Auto-reply message sent by SPAM software 
            // where only verified email addresses are accepted. 
            console.log("Challenge: " + bounce.BounceAddress);
        }

        if (bounce.BounceType == 13) {
            // Address Change Notification Message.
            console.log("Address Change: " + bounce.BounceAddress);
        }

        if (bounce.BounceType == 14) {
            // Success DSN indicating that the message was successfully relayed.
            console.log("DSN Successful Relay: ");
        }

        i = i+1;
    }

    success = mailman.Pop3EndSession();

}

chilkatExample();