Sharepoint Server 2013 workflow notifications

Hellow Everyone !

I have question about Sharepoint outgoing email alerts . Yes , i know this  theme was discussed before .. but i'm  a little bit stuck . There are few ways to send these  alerts via hMailserver , local  server (anonymous account), and external gmail and other stuff .  In my case .... i got local email server which  runs Linux Exim (it has  an option to configure it  to accept anonymous connections !). But the  question is .... is there way to configure SP to send  email through authorized connection ?