Vesta SMTP Configuration - ERROR

[br5dy]

Hello,

I'm getting bounce-back e-mails from Vesta on my server.

Error: "551 This mail server requires authentication"

I have exim installed and would like it to use my mail server. How do I configure Vesta to do that? I tried dpkg-reconfigure and set the smart host, but where do I set the username & password and security to SSL?

Thanks