[opendmarc-users] OpenDMARC Postfix SPF implementation

[Scott Kitterman]

On Saturday, April 26, 2014 12:10:48 Andreas Schulze wrote:
> Scott Kitterman:
> > The trick here is that milters don't see the first header field  added.
> 
> that sound strange
> 
> here we run milter in multiple configuration for years but this
> behavior I couldn't observe.
> OK, I have my smf-spf milter patched. Maybe that's the reason...
> 
> But then I don't think implementing spf in yet another milter will be
> a smart solution.
> 
> > What I do is check SPF in a first smtpd instance, send the mail
> > through spam/virus filtering, and then back to a second smtpd where
> > I run the opendmarc milter.
> 
> That way you could not reject on p=reject without generating backscatter.
> Postfix *is* able to call 4 milter in chain (smf-spf, opendkim,
> opendmarc, amavis-milter)
> and any milter see header added by a previous...

Multiple milters work fine.  It's if the header field was added by something 
else, in this case a policy server.  I don't reject because of DMARC yet, so 
it's not currently an issue for me.

Scott K