On Sun, 23 Oct 2022, Lyndon Nerenberg (VE7TFX/VE6BBM) via mailop wrote:
If you're running OpenSMTPD (such as an OpenBSD system),
here's how to return the favour to t-online.
In smtpd.conf, before any of your 'listen' statements, add:
filter dtag phase mail-from match rdns regex "\.t-online.de$
If you're running OpenSMTPD (such as an OpenBSD system),
here's how to return the favour to t-online.
In smtpd.conf, before any of your 'listen' statements, add:
filter dtag phase mail-from match rdns regex "\.t-online.de$" \
reject "550 5.7.1 you don't accept our mail, so we don't accept
