On Thu, 2009-03-05 at 21:31 +0800, Adi Nugroho wrote:
> I found that a lot of spam is using recipient email address as the sender.
> (from a...@internux.co.id to a...@internux.co.id, or from i...@apache.org to 
> i...@apache.org).
> 
The only disadvantage is that you'll label test messages as spam.

> Since if we mail to our self, usually we have very low score, I hope it is 
> save to give a BIG score (probably 2 or 3).
> 
> Is there a hint how to make this custom rule set?
> 
Use a meta rule:

describe SELF Trap mail with forged sender the same as recipient
header   SELF From =~ /\...@my.address/i
header   SELF To =~ /\...@my.address/i
meta     SELF 5.0

This will work for a domain where internal mail is *not* scanned by SA. 


Martin

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