DKIM konforme Mailing-Listen

4 Aug 2015


      Hallo Liste,
habe die beiden Blog-Einträge auf blog.sys4.de gelesen und versuche
grade eine DKIM-konforme Mailing Liste zu konfigurieren.
Mailman Version 2.1.20
Die entsprechenden Direktiven in der mmcfg.py sehen so aus:
---
# The following is a three way setting.  It sets the default for the list's
# from_is_list policy which is applied to all posts except those for which a
# dmarc_moderation_action other than accept applies.
# 0 -> Do not rewrite the From: or wrap the message.
# 1 -> Rewrite the From: header of posts replacing the posters address with
#      that of the list.  Also see REMOVE_DKIM_HEADERS above.
# 2 -> Do not modify the From: of the message, but wrap the message in
an outer
#      message From the list address.
DEFAULT_FROM_IS_LIST = 1
ALLOW_FROM_IS_LIST = Yes
# Do not break existing DKIM signatures
DEFAULT_SUBJECT_PREFIX  = ""
DEFAULT_MSG_HEADER = ""
DEFAULT_MSG_FOOTER = ""
---
Leider meckert mein Mail-Server immernoch, dass die erste DKIM-Signatur
nicht mehr korrekt sei und die Mail verändert wurde.
Da stehe ich aktuell auf dem Schlauch. Des Weiteren ist mir aufgefallen,
dass hier auf der Liste der From-Header nicht mehr "Autor via
Listenname" lautet sondern nur den ursprünglichen Autor enthält. Warum
ist das so und die DKIM-Signaturen sind trotzdem korrekt?
Viele Grüße,
Tobias
P.S.: Anbei ein Beispiel eines Header einer Mail meiner Liste:
Authentication-Results: winnetou.kokelnet.de (amavisd-new);
    dkim=pass (2048-bit key) header.d=lists.freifunk-mwu.de
    header.b=gVoLtNo9; dkim=fail (1024-bit key)
    reason="fail (message has been altered)" header.d=hachmer.de
    header.b=mTQwAKes
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=
    lists.freifunk-mwu.de; h=reply-to:from:from:list-subscribe
    :list-help:list-post:list-archive:list-unsubscribe:list-id
    :precedence:content-type:content-type:mime-version:user-agent
    :date:date:message-id:subject:subject:received:received:received
    :received:received:received:received:received:received; s=
    mail201507; t=1438710780; x=1440525181; bh=No13gESS3ijjWw4vdYwTT
    749sVehetUqcGudn0DUXcI=; b=gVoLtNo9zsIAGXBq1MRVWZGMr6bM+e2UW/3x3
    tL/Ud3BgPz2pHlDH3c9RydaT/TedkpMoQ3Q9L73QoLeF4IkPu+EXV1UbDImcfiQP
    OwZ/uaz9pN+41iACfZq49WApMsjiM8mk6Jycl9vMejY4p1RBfJwD1B+emVivfmXZ
    2ODZkAy1LbZbyhCruum2xY3hP94adMyLb66U2TW6f9m4m3/8f25Rhjeail4XhxE6
    FHeRMf26YnL628Sn1Gbut3Kkn7MSmJO6HNmR90X4nJI4R0nzM+YzMlbsZjcFUsHU
    rWH5/UZJp3ZL4VNaGDiX02yZEV9hHNId/vm5tl+ngONs8eyjw==
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=hachmer.de; h=
 content-type:content-type:mime-version:user-agent:date:date
 :message-id:subject:subject:from:from:received:received
 :received; s=d1024; t=1438710777; x=1440525178; bh=No13gESS3ijjW
 w4vdYwTT749sVehetUqcGudn0DUXcI=; b=mTQwAKesMfgjATTYbCfIKM6w3TCuC
 iyZZ2FECgV1KNBxOMduHh9SNb2wyMacEymb7hZKoHETG52G3sDMHM1zzujgG31X9
 2z7S+WXN+YtdcNqmRBlKqCf42XydI/LIqvzhSUiDuxSUM1GZ/Jf8O9tK4yuUDUuW
 +DEErLQXl6i248=
To: admin@lists.freifunk-mwu.de
Subject: test
X-Mailman-Version: 2.1.20
From: Tobias Hachmer via Admin admin@lists.freifunk-mwu.de
Reply-To: Tobias Hachmer tobias@hachmer.de