[Exim] remote smtp auth

Hi!

I got a litte problem here. I use exim only locally for delivering mail to
smtp://mail.gmx.net, the mailserver over which I send my mail on the
internet. This server users smtp auth. How can I configure exim to send
authenification data to that server before transfering any message?

Thanks.

--
Simon Fuhrmann | NightSlayer@??? | www.dismember.de