index.js
function smtpUnsubscribeEmails(callback, emails ) {
    if (emails===undefined){
        return callback(returnError('Empty emails'));
    }
    var data = {
        emails: serialize(emails)
    }
    sendRequest( 'smtp/unsubscribe', 'POST', data, true, callback );
}
function smtpUnsubscribeEmails(callback, emails ) {
    if (emails===undefined){
        return callback(returnError('Empty emails'));
    }
    var data = {
        emails: serialize(emails)
    }
    sendRequest( 'smtp/unsubscribe', 'POST', data, true, callback );
}
SMTP: add emails to unsubscribe list

@param callback
@param emails