OpenDKIM
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too much header data
Version opendkim 2.11 libmilter version 1.0.1 Mode "s"
Email with > 3600 Adresses in "From:" and "Cc:" (all the same btw..) leads to a logged opendkim-error "Too much header data". That looks okay..
But postfix reports "Service unavailable", because the milter-response seems broken.
Could you upload your test message?