DKIM sign only unsigned

[Matus UHLAR - fantomas]

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, uhlar at fantomas.sk ; http://www.fantomas.sk/
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