[Mimedefang] SPF in MD

[Michael Weiner]

On Fri, 2004-10-08 at 12:08 -0400, Michael Faurot wrote:
> In article <1097235425.3912.4.camel at nomad> you wrote:
> 
> > Has anyone used mime-defang filters to do any portion of the SPF
> > implementation? What i mean is, has anyone constructed a MD filter that
> > deals with email based on the results of spf records?
> 
> I implemented a front-door check in MD's filter_sender() function to do
> rejections based on "fail" results.  I then inserted my own Received-SPF
> headers and created rules for SpamAssassin v2.X to score against for
> all the other SPF results.  Since SpamAssassin v3.0.0 has come out,
> I could use those SPF tests now, instead of the ones I created.
> 
> It's fairly easy to implement SPF within MD, especially to do rejections
> based on "fail" results.  Much easier than implementing SRS[1], as I'm
> discovering. At a high level you would do the following:
> 
> 
> 	o)	Install the Perl module Mail::SPF::Query.
> 
> 	o)	Insert a "use Mail::SPF::Query;" line into
> 		mimedefang-filter.
> 
> 	o)	Put together a function to do the SPF query or
> 		integrate it directly into filter_sender().
> 
> 	o)	If you get a "fail" result from the query you can
> 		then reject the message.
> 
> 	o)	For all the other SPF results, you don't need to
> 		do anything, just let SA v3.0.0 score them.
> 

Thank you for the detail. I appreciate your taking the time to do this
to help educate a somewhat MD newbie. Agreed, i have been using SA3
since the first rc came out and have been loving it, especially since
the SPF checks are there, but i was interested in the exercise through
MD which you have described above.

Yes, example code illustrating a real life working example is VERY
helpful, and is the method i believe most of us learn from.

Thanks again for ALL your time in your response.
Michael Weiner

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