On Sun, 1 Mar 2009, Seba wrote:
> DKIM signs the spam mails when the sender address is forged (if sender 
> address is a recipient in mydomain) - but this should not be I think.
>
> Spam comes in, gets signed if sender is a recipient in my local domain 
> and gets delivered to the mailbox of the user. Are there any settings to 
> prevent this?

Yes.  The OPERATION section of the dkim-filter(8) man page explains the 
decision process regarding whether to sign a message or verify it.  Some 
tuning based on the information you find there will probably solve your 
problem.

If externally-originated mail with a forged From: header is being signed, 
my first guess would be you have an "internal hosts" list which is too 
permissive.

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