Maximilian Wilhelm
@BarbarossaTM@noc.social
Updated my mail server a week ago, had some troubles and installed firewall DROP rule for 25/tcp for IPv4 and IPv6. Once everything was fine again, I believed I removed both rules.
I got mails, and everything looked great!
Today, I was informed, that my MX did not accept mails from an AWS relay, and turns out, I only enabled IPv6 again, and forgot about IPv4. 😅
MX goes brrr...