* Randolf Richardson, Postmaster via mailop: > The PTR RR is important for outbound mail [...]
Thanks, I am fully aware of the importance of defining the proper DNS RRs for both forward and reverse lookups for MTAs. The resource records are in fact fine for the affected IP address. More importantly though, like I wrote before: No outbound SMTP mail connection is supposed to ever be established to third parties. That is being enforced via "relayhost = [172.16.x.y]:587" (Postfix). Private destination address, and destination port != 25. The Postfix instance also does NOT listen on anything except localhost, i.e. accepts no inbound connections. Even if someone managed to breach the firewall. That's not a machine one expects to end up on a blocklist, IMO. -Ralph _______________________________________________ mailop mailing list [email protected] https://list.mailop.org/listinfo/mailop
