maillist mx discard policy

Matthew Seaman m.seaman at
Thu Aug 19 08:23:55 UTC 2010

On 19/08/2010 07:54, Jeff Laine wrote:
> So, the question is: do the maillist servers follow SPF
> records or PTR record is mandatory?

The PTR is mandatory.  The vast majority of SMTP senders without proper
PTR records are zombie machines spreading spam.  Anyone running a real
mail system should be capable of arranging for a correct PTR in the DNS
-- if they aren't then they have no business at the controls of a MTA.

As far as I know, the mailers don't pay much attention to
SPF -- generally the accepted practice seems to be to use SPF as part of
computing Spam scores, but not to make accept/reject decisions solely
based on SPF.



Dr Matthew J Seaman MA, D.Phil.                   7 Priory Courtyard
                                                  Flat 3
PGP:     Ramsgate
JID: matthew at               Kent, CT11 9PW

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