> I am setting up a firewall for our mail server, and intend to block all ports,
> save those required for sendmail to work , which ones should i allow in.
Only 25. This is the standard SMTP port. If you want to use ssmtp 465 is
required too. If you want that users can access this box via pop3 (110)
and/or imap(143) you should enable these ports too. If you don't want to
allow downloading users' email from outside the 110 and 143 ports are
should only be allowed from inside.
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