telnet to localhost

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From: nnmmss <nnmmss@xxxxxxxxxxxxxxxxxxxxxxxxx>
Date: Tue, 19 Jul 2005 03:45:06 -0700

I have a mail server and also the sMTP service is enabled. on this server i
don't have any isa server, i want to telnet to other smtp server , but
connecttion failed happens, i even can not telnet to localhost
telnet 127.0.0.1 25
Could not open a connection to host on port 25 : Connet failed

but in this server i can send email without problem
how can i debug the problem?
.

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