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I have a few questions, I just installed SMTP on my Ubuntu server, and I want to know how to connect to it from a different machine... I'm not really clear.

I tried:

telnet my.servers.ip.address 25

I think it's running on port 25, but I don't know where to find out, its not in the conf file anywhere.

Additionally do I need it to be a FDQN? or can I just access my mail server via it's IP address? I know that the service works on the machine because I'm able to 

echo test | mail -s "test" me@gmail.com

Any help debugging or understanding this would be helpful, thanks guys!

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"installed"? Did you configure it? – Ignacio Vazquez-Abrams Dec 21 '10 at 22:48
I did, but I'm not really 100% sure what the right configuration is, lots of the tutorials suggest setting it up as a "Satellite", but I'm just not sure what is the common, setup or rather the preferred one. – Joseph Silvashy Dec 21 '10 at 22:55
What smtp server - postfix? – ring0 Dec 21 '10 at 23:16
Yah I'm using postfix. – Joseph Silvashy Dec 22 '10 at 0:45
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You can use the netstat command to see which services are listening on what ports.

   netstat -ntlp

Make sure the mail server is listening on more than just the loopback interface. It most likely isn't by default, for security reasons.

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