>
> just add that IP to "mynetworks" and send the mail to your server the
> normal way via port 25... Less to set up...
>

IMHO: no need to listen to 25 on the public ip if you aren't going to
receive any email from there.
"mynetworks" will protect server from open relay, but still many bots will
try to send something through it and pollute server logs.

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