I am using Zimbra OCS (current version) but having an issue currently:
I have activated DKIM a few months ago which works so far BUT just without any kind of email signature (text + HTML).
As soon as an email signature is activated (withing web portal as well as Thunderbird) DKIM fails.
Steps to reproduce:
Send a blank email without anything to check-auth@verifier.port25.com -> everything pass
Send an email with signature to check-auth@verifier.port25.com -> fails with error:
Code: Select all
DKIM check details:
----------------------------------------------------------
Result: fail (wrong body hash: expected BHq4oJWxzxyFsLulcSVJ4wzZz7wnZZqAn5K6rgwqTW4=)
ID(s) verified:
Canonicalized Headers:
date:Mon,'20'18'20'Feb'20'2019'20'21:58:21'20'+0100'20'(CET)'0D''0A'
from:Mathias'20'=?utf-8?Q?M=C3=BChlbacher?='20'<mathias.muehlbacher@hks-projekt.at>'0D''0A'
to:check-auth@verifier.port25.com'0D''0A'
message-id:<2120121276.2139.1550523501414.JavaMail.zimbra@hks-projekt.at>'0D''0A'
mime-version:1.0'0D''0A'
dkim-signature:v=1;'20'a=rsa-sha256;'20'c=relaxed/relaxed;'20'd=hks-projekt.at;'20's=81BFB7CE-CC86-11E8-8DC4-91CA4D724663;'20't=1550523501;'20'bh=huNNLF3Uf6i6ot5TU5C/vBLXQyX8jr+ZQPYTdJGXtd8=;'20'h=Date:From:To:Message-ID:MIME-Version;'20'b=
Canonicalized Body:
'0D''0A'
--=_160d4225-0aa8-4152-b95a-25a52a542779'0D''0A'
Content-Type:'20'text/plain;'20'charset=utf-8'0D''0A'
Content-Transfer-Encoding:'20'quoted-printable'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
Freundliche'20'Gr=C3=BC=C3=9Fe,=20'0D''0A'
'0D''0A'
Mathias'20'M=C3=BChlbacher=20'0D''0A'
'0D''0A'
--=_160d4225-0aa8-4152-b95a-25a52a542779'0D''0A'
Content-Type:'20'text/html;'20'charset=utf-8'0D''0A'
Content-Transfer-Encoding:'20'quoted-printable'0D''0A'
'0D''0A'
<html><body><div'20'style=3D"font-family:'20'arial,'20'helvetica,'20'sans-serif;'20'font-s='0D''0A'
ize:'20'12pt;'20'color:'20'#000000"><div><br></div><div><br></div><div'20'data-marker='0D''0A'
=3D"__SIG_PRE__">Freundliche'20'Gr=C3=BC=C3=9Fe,<br><br>Mathias'20'M=C3=BChlbache='0D''0A'
r</div></div></body></html>'0D''0A'
--=_160d4225-0aa8-4152-b95a-25a52a542779--'0D''0A'
Best regards,
Mathias