@boneidol Talking back at you. Comparing with e-mail. There are email lists where mail operators share information, for example the "Spammers Don't Like Us" mailing list and the MailOPs mailing list.

It's not unusual to see messages like "I'm queueing messages to foo.example.org, can someone ping the postmaster there and get in touch"

It's super helpful, and even allows access for the little people to the Behemoths of email.