[opendmarc-users] OpenDMARC Postfix SPF implementation

[Andreas Schulze]

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...

Andreas