Entry

How can I get qmail to check the domain name portions of envelope sender mailbox names?

Feb 27th, 2004 05:12
Jonathan de Boyne Pollard, http://qmail.org./qmail-1.03-mfcheck.3.patch http://homepages.tesco.net./~J.deBoynePollard/FGA/verisign-internet-coup.html#ConsequencesBypassAntiUBM

Nagy Balazs' patch will cause "qmail-smtpd" to perform DNS 
lookups against the domain name portion of the envelope sender 
mailbox name, and reject mail transactions where those lookups 
fail.
However, note that Verisign's "*.com." and "*.net." wildcards 
did, and will again (when Verisign reinstates them, as is 
seeming increasingly likely at the time of writing this 
answer), entirely undermine this anti-UBM measure.