On 15.10.16 21:08, Petr Bena wrote:
> if my mail server sign every single e-mail with DKIM, that e-mail should
> be signed even if it's redistributed by mailing list daemon or not?
Sadly, there are mailing list admins who think it wise to have subject
lines or message bodies modified, e.g. by adding prefixes or footers.
The Roundcube Users mailing list is one such example. The modifications
will invalidate DKIM signatures if any signed header/body is affected.
Personally, I have policies that prevent e-mail sent to this type of
mailing list from ever being DKIM-signed on my end, to avoid "DKIM
failed" scores on the receiver side. Really annoying.