On Thu, 30 Apr 2026 21:21:43 +0200 Michael Grimm via Postfix-users <[email protected]> wrote:
> #) Using FreeBSD's pf firewall functionality to block all traffic leaving my > servers via ports 25, 465, and 587, respectively, that has not originated > in a FreeBSD jail running postfix Packets from SMTP clients tends to leave your server via ephemeral ports allocated dynamically. If you meant to say "going to ports 25, 465, and 587" these are well known SMTP ports, but this will not stop some process connecting to SMTP servers running on other ports. If you control all processes on your server, this may not be an issue. If you expose complete jails to other users, they may create tunnels to bypass your firewall. _______________________________________________ Postfix-users mailing list -- [email protected] To unsubscribe send an email to [email protected]
