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Date:      Mon, 26 Nov 2018 19:52:59 +0700
From:      Victor Sudakov <>
Subject:   Invalid DKIM signatures in this list
Message-ID:  <>

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Dear Colleagues,

I have noticed that the Mailman which manages this list keeps the 
sender's "DKIM-Signature:" header intact but modifies the body of the 
message by adding a footer.

This behavior invalidates the sender's digital signature with
"dkim=fail (body hash mismatch; body probably modified in transit)". 

I think, according to the common sense and RFC6377, the Mailman should 
either remove the "DKIM-Signature:" when modifying the body, or 
refrain from modifying the body, or add its own valid "DKIM-Signature:" 
from scratch. What is currently happening does not make sense.

Whom do I contact about it?

An example of this behaviour can be seen in the message with 
 Message-Id: <> and others.

Victor Sudakov,  VAS4-RIPE, VAS47-RIPN

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