[Exim] OT. Problems on connecting to some servers on port 25

I've noticed that some servers do not allow my server to connect on port
25 for SMTP, when doing a manual test with:

$ telnet mx.some.server.com 25

from the server it just stays on:

Trying x.x.x.x

but if I try to telnet that remote server from another box on mynetwork
I get the welcome message from the MTA on the other side. Does anybody
have had the same kind of problems? I try to search for my server on
sever black lists but is not on any. I was trying with tcpdump, but
don't know what to look for in the output. Any ideas?


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Fernando Sanchez
Dpto. Sistemas USFQ