gettor appears to be in an email loop war with a .sk address
I happened to be looking at eugeni's mail.log for other debugging, and saw that approximately 25% of the lines in mail.log contain the string gettor.
(Yesterday, eugeni's postfix had 460k lines in it, and 101k of them said "gettor" in them. Today in the first hour or so, it's 7k out of 25k.)
Does gettor get into fights with external addresses, where it replies to the bounce, gets another bounce and replies to that, etc?
There are probably smart guidelines for avoiding mail loop wars, like not answering names that start with mailer-domain, checking for the presence of an X-Something-Something header, or rate limiting responses to a given address.
And this is a great case where unifying how bridgedb handles its email answers, and how gettor does it, will save a lot of headache.