Dovecot -v 2.2.27 (c0f36b0): Outgoing mail server fails

[Tommy Lane]

Hello Everyone,
 I'm having an issue with a recent install of postfix and Dovecot. I can authenticate without any issues for "incoming" mail server, but when I attempt to send an email from the account my client gives an auth error. the server shows that I was authed using plain-auth, which I would also like to change as these machines are accross the open internet.

Any help would be greatly appreciated.

-Tommy