unable to send email to some domains

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I have a really weird problem I can't figure out.  I am unable to send
email to some networks because the destination mail server refuses to
connect.  But if I connect to the mail server from a host inside my
private ip-masqueraded lan it works.  Here is what happens:

>From my mail server:
mailserver:~# telnet remote.mailserver.com 25
Trying xxx.xxx.xxx.xxx...
telnet: connect to address xxx.xxx.xxx.xxx: Connection refused

But if I attempt from my box that is behind the ip masquerading firewall I
get:
orion:~> telnet remote.mailserver.com 25
Trying xxx.xxx.xxx.xxx...
Connected to remote.mailserver.com.
Escape character is '^]'.
220 *************************************2******2**********0
****2002**2**0*****0*00

Anyone have an idea why connections from the public mail server don't work
but from inside the masqueraded lan they do?

James Rich

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