[CentOS] Help with sendmail ( or Iptables ... or DNS)

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Hi, i have a CentOS 4.4 running sendmail, with two network interfaces
(eth0 -> Internet , and eth1 Local Network), from the terminal (SSH) i
do

telnet 127.0.0.1 25

and it connects to sendmail (i think so), but

from another server (external, and so from the same SSH terminal) i
try to connect to the Internet IP

telnet 146.77.220.236 25
Trying 146.77.220.236...
telnet: connect to address 164.77.228.236: Connection refused
telnet: Unable to connect to remote host: Connection refused

so i was thinking "it could be the fu...ing IPTABLES"

from terminal execute

iptables -L| grep smtp

and the result is:

ACCEPT     tcp  --  anywhere             anywhere            tcp dpt:smtp

so , if the sendmail service is up, what could be happen??
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