Crap, I should have mentioned this, but after I make the above connection attempt, I do actually get a connection. I can't believe I didn't explain this.
220 serverx.domain.com ESMTP Sendmail 8.12.9/8.12.9; Thu, 22 Apr 2004 15:3 1:21 -0500 (CDT)
The problem is, as soon as I try to type anything at all, like "helo mydomain.com" it automatically disconnects me, every time. I can't even type a single character, it disconnects.
Ah, that would be due to something not handling the connection properly. That could be their mailserver not handling it properly, or a firewall. It means that they are expecting your responses to be in just one packet each, whereas telnet will split up the responses into multiple packets. It's a common amateur mistake when writing server software.
I understand what you're saying about it being something I'm doing, but for the life of me I don't what I'm doing wrong or missing here. You want a bigger kicker, I can telnet to the above server just fine from my desktop on my internal network and get an okay response from it, I just can't do it from any of my servers including the Mail server of course.
Most likely, those servers have some sort of firewall software that is blocking the connections, due to the multiple packets. If your telnet client allows it, you can have it send your responses in a single packet, which should bypass the firewall.
-Scott
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