full-disclosure - Strange Emails -- What are they?

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Message-ID: <44872884.6090907@csuohio.edu>
Date: Wed Jun  7 20:27:13 2006
From: michael.holstein at csuohio.edu (Michael Holstein)
Subject: Strange Emails -- What are they?

> What would really help is SPF, if you can manage it. That way you can 
> reject mail that claims to come from your domain but does not come from 
> your mail servers.  But this is all a bit OT, not really full disclosure.

Well, sort of. Too many domains do something like '~' or '?' instead of 
'-' like they should.

(dig -t txt $domain) :

AOL : ?all
Hotmail/MSN : ~all
Google : ~all

http://en.wikipedia.org/wiki/Sender_Policy_Framework

AOL's is perticularly ironic, considering they hard-hand other folks 
into publishing a SPF record to deliver to them, but publish a ?all (no 
policy) record themselves.

What you can do quite effectively though, is to consider SPF (to 
penalize) as one of several factors in something like SpamAssassin.

~Mike.