Postfix servers are only listening on localhost port 25.

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Issue

I have smpt servers running postfix, and they can't telnet or ssh to each other on port 25.
netstat -tunap |grep 25 shows:

tcp        0      0 127.0.0.1:25                0.0.0.0:*                   LISTEN      2218/sendmail

Environment

Red Hat Enterprise Linux 5
Red Hat Enterprise Linux 6

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