At 11:12 2004-04-14 -0500, Timur Tabi wrote:
I've been hearing a lot about SPF recently, and how it's a way to detect
email with forged sender.
It sounded pretty good, but watch out for a big caveat: mail forwarding.
Unfortunately, I'm a procmail newbie and I know even less about how email
works. I asked my ISP if they could implement SPF, and they said they'd
think about it. In the meantime, I'd like to be able to do as much as I can.
Get an SPF checker and call it from procmail. There's a Perl module
available from the SPF project pages, IIRC. No, I don't use it.
Based on this, it looks like I'm barking up the wrong tree, but I want to
hear the opinion of the experts on this list first. Is there anything I
can do SPF-wise in my .procmailrc?
If you can call an SPF checker, you can implement checking in your
procmailrc, but procmail ITSELF won't do the checking - it can only CALL
something which does.
Part of the goal of SPF and DNSBLs is to avoid the bandwidth hit from
accepting crap mail in the first place. Once your MTA has accepted the
message (so that it can be post-processed by procmail), you've already
taken that hit. At that point, it makes sense only as a contributor to a
spam check.
---
Sean B. Straw / Professional Software Engineering
Procmail disclaimer: <http://www.professional.org/procmail/disclaimer.html>
Please DO NOT carbon me on list replies. I'll get my copy from the list.
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