Has anyone written a patch for Qmail 1.0.3 to reject mail if envelope sender
domain can't be resolved?
I'm providing a backup MX for someone who is running Sendmail 8.9.x, and
my queue is full of spam that keeps getting
"451 <user@baddomain>...Sender domain must resolve"
responses. I'd really like to avoid accepting this stuff in the first
place.
I read the FAQL and www.qmail.org, but didn't seem to find anything that
quite fits the bill, though I think I'll try the Russell's RBL patch.
[I'd also like to whack the people that have written MTAs or MUAs that don't
respect the precedence field of MX records with a very large clue stick!]
Thanks!
Eric
