One way to narrow down trouble shooting to know if its a firewall or config
issue is to check if postfix has bound to the ports for listening.
[root@host /]# netstat -nlp46
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State
PID/Program name
tcp 0 0 0.0.0.0:25 0.0.0.0:* LISTEN
165324/master
tcp 0 0 127.0.0.1:53 0.0.0.0:* LISTEN
894/named
udp 0 0 127.0.0.1:53 0.0.0.0:*
894/named
udp 0 0 127.0.0.1:53 0.0.0.0:*
894/named
You can see if postfix "master" is listening on your port ":25" and if it's
to all IP's or only one that might not be accessible to the public.
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