index.js
function getSenderActivationMail(callback, senderEmail ) {
    if ((senderEmail===undefined)||(!senderEmail.length)){
        return callback(returnError('Empty email'));
    }
    sendRequest( 'senders/' + senderEmail + '/code', 'GET', {}, true, callback );
}
function getSenderActivationMail(callback, senderEmail ) {
    if ((senderEmail===undefined)||(!senderEmail.length)){
        return callback(returnError('Empty email'));
    }
    sendRequest( 'senders/' + senderEmail + '/code', 'GET', {}, true, callback );
}
Request mail with activation code

@param callback
@param senderEmail