Automatically Using Another SMTP Server?

[nko]

I have a machine with an app and an SMTP server installed on it. The app always wants to use the local SMTP server to send e-mails. Unfortunately, my network is set up such that e-mails can only be sent by one specific machine (the almighty 10.0.0.3!!). Is there a way to specify, system wide, that all SMTP requests should be dealt with by this other machine?

[Modorf]

what about setting your local SMTP server to relay to your lan SMTP server (10.0.0.3)?

[nko]

That sounds like a great idea!!!!!!!

How do I do that? It looks like I've got exim4 running on this machine. I don't even know where to start, really, except poking around /etc.

[Modorf]

http://www.debian-administration.org/articles/63