Advice on SMTP setup for outgoing mail from internal devices only?

Hello.
I'm trying to set up a basic SMTP server using OS X Server (10.5.6) so I can have devices (Server Monitor, my UPS power system alerts, router alerts, etc. — all on the local LAN/same subnet) send out mail when they need to send out alerts. These devices do not have the ability to configure SMTP authentication, so I just need to set up this outgoing SMTP server on one of my Xserves so they have a way of sending said mail.
Would anyone be willing to provide information on how I'd set this up?
I thought I had it set up correctly, but whenever I try and send a test email (from my mail.app account), I never receive anything at the intended delivery address (an email address hosted by a 3rd party)?
Thanks!
Kristin.

The default mail server configuration should accept mail from local clients and relay it to the destination domain. The only gotcha would be if the mail server thinks it's authoritative for the domain you're sending to (e.g. you're sending to '[email protected]' and this server thinks it is the mail server for 'yourdomain.com'. There are various ways of overcoming this - the easiest of which is to tell the server it's not authoritative for yourdomain.com.
The mail logs will give you an indication if that's the problem - it'll either say it delivered the mail locally, or that there was some problem connecting to the remote mail server.
Either way your ISP can't be blocking outgoing SMTP traffic (well, they could, but it would be pretty stupid of them), but your internal traffic shouldn't be touching your ISP's network anyway, which may indicate a configuration problem.

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