SMTP Mail setup NAV 2016 Question

Hi Folks -

One of our customer has the below SMTP Mail setup

SMTP Server -

SMTP Server Port - 587

Authentication - Basic

User id -

Password - ********

Secured Connection  True

Everything works fine with sending out notifications and just works fine.

They want to add another email id to send out notifications for customer service and when you add the code in 

Mail.CreateMessage('TAX CERTS.','',TempEmail,

SubjectText,BodyText,TRUE);   It errors out with below error

Any help is highly appreciated.