On Thu, 10 Jun 2010, Jerrale Gayle wrote: > On 6/10/2010 6:31 PM, Sahil Tandon wrote: > >On Thu, 10 Jun 2010, Jerrale Gayle wrote: > > > >>smtpd_reject_unlisted_recipient = no > >Bad idea. > > > >>Would this be better put by itself or under > >>smtpd_recipient_restrictions = reject_unlisted_recipient=no? > >Bad idea + unsupported syntax. > > > >>I want to accept all mail to non-existent users, then bounce, so > >>that people can't probe for valid users to know wherer to start a > >>brute force. > >This is a horrible idea; please do not do this. Google 'backscatter'. > > > IF I have repeating undeliverable mail being redirected to > postmas...@mydomain, I don't see why this would be a bad idea.
This is my last reply on this topic; from wikipedia: Backscatter occurs because worms and spam messages often forge their sender address, and mailservers configured by naive administrators send a bounce message to this address. -- Sahil Tandon <sa...@freebsd.org>
