Keld Jørn Simonsen a écrit : > On Tue, Jul 14, 2009 at 07:57:27PM -0400, John Peach wrote: >> On Tue, 14 Jul 2009 17:49:13 -0600 >> LuKreme <krem...@kreme.com> wrote: >> >>> On 13-Jul-2009, at 16:24, Keld J__rn Simonsen wrote: >>>> Is there a way to disambiguate between DNS timeouts and DNS errors, >>>> and discard the latter? >>> >>> Why the devil would you want to discard mail based on a DNS error? >>> DNS errors have a habit of being quite transient. >> The OP seems determined to shoot himself in the head, never mind the >> foot. > > Well, a DNS NXDOMAIN error seems a good reason for discarding mail.
even NXDOMAIN may be a temporary error that the admin can fix. discarding mail is bad. reject is ok. (that said, I stopped using this check since a long time, because I saw it defer mail from good senders, without much benefits (it didn't stop spam that wasn't blocked by other safer rules, or at worst by spamassassin). note that the envelope sender may be wrong (misconfiguration) while the From: header be good, which means the sender is reachable. > I am not so sure about the SERVFAIL error, so I would leave that for > now. > > Thanks to everybody that helped soved my problems here. > > Best regards > Keld
