custom_emails.js

exports.hook_rcpt = function (next, connection, params) {
    var recip = params[0];
    if (connection.relaying) {
        // Already relaying - skip.
        return next();
    }

    if (recip.host != 'emailitin.com') {
        return next(DENY, "Invalid domain");
    }
    
    if (connection.transaction.rcpt_to.length > 1) {
        return next(DENYSOFT, "Can only deal with one recipient at a time");
    }

    if (recip.user === 'support' || recip.user === 'help' || recip.user === 'matt') {
        connection.relaying = true;
        recip.user = 'helpme+emailitin-' + recip.user;
        recip.host = 'gmail.com';
        recip.original = recip.user + '@' + recip.host;
        this.loginfo("Special user - relaying this email to: " + recip.original);
        return next(OK);
    }

    next();
}