mz.ru is broken.
maxmail.co.uk is horribly broken. maxmail.co.uk should win the "Broken
of the year" award.
Everything is working the way it should be working.
I didn't state that these domains' DNSes are not broken, I just said
courier reports these existent domains as nonexistent. The fact that
domain have broken DNS records could not automatically be treated as the
reason for bouncing all mail from that domain.
It most certainly is. That's the whole purpose of the CHECKDNS option: to
bounce mail from undeliverable domains. None of those domains are
"Most certainly" doesn't mean "always". One example: mz.ru is undeliverable
but perfectly valid domain of mailing list server mailzone.ru. These gyus
intentionally or erroneously configured their domain as undeliverable, but
there could be users who nevertheless would like to recieve messages from
It would be nice if courier could make difference between "nonexistent" and
"nondeliverable" domains and postmaster could configure BOFH options for