DKIM sign only unsigned

Matus UHLAR - fantomas <[email protected]>
Newsgroups gmane.mail.virus.amavis.user
Message-ID <[email protected]> 
Hello,

we have mail gateway where most of internal mail comes already signed, and
I'd prefer to sign only mail that is not signed already.

can I dkim-sign only mail that is not already signed?

Thanks.

-- 
Matus UHLAR - fantomas, [email protected] ; http://www.fantomas.sk/
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