Tom Reed via Postfix-users:
> Hello
>
> my postfix has SSL certificates deployed.
>
> Can I setup only port 25 open to the world? If port 465/587 are filtered
> by iptables which only permit internal users to connect, does this make
> sense to external MTAs (such as google, MS's)?
Port 25 is for receiving mail from other mail servers.
Ports 465/587 are for receiving mail from mail clients.
Wietse
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