[postfix-es] Firewalling for mail ralay

[Jeronimo L. Cabral]

Dear, I have a Postfix server in order to relay messages from my company to
Internet.

So this SMTP server is for OUTBOUND messages only, it never receives
messages from Internet.

This server is behind a firewall, so in this firewall do I have to just
enable outgoing traffic to Internet in TCP/25 port, or also do I have to
enable incoming traffic to TCP/25 port from my Postfix ???

Special thanks,

JeLo
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