Im trying to get my head around this problem that too many valid emails from the mailing list fail dmarc. Why when other mailing list don't seem to have the same problem? I see today it says "signature verification failed", but why? Is there a problem with protonmail's dkim key? Is the dovecot list altering the message body? Is something wrong on my server's end?

The example today was an email from @protonmail.ch, and the headers were:

  Return-Path: <[email protected]>
  Delivered-To: [email protected]
  Received: from smtp.ptld.com
      by host.ptld.com with LMTP
      id +SjBLQqiFmFSbgIAjbxwTg
      (envelope-from <[email protected]>)
      for <[email protected]>; Fri, 13 Aug 2021 12:47:06 -0400
  Received: from talvi.dovecot.org (talvi.dovecot.org [94.237.25.159])
      by smtp.ptld.com (Postfix) with ESMTPS id 4GmTx61z3fz4l3g2
      for <[email protected]>; Fri, 13 Aug 2021 12:47:06 -0400 (EDT)
Authentication-Results: smtp.ptld.com; dmarc=fail (p=quarantine dis=none) header.from=protonmail.ch Authentication-Results: smtp.ptld.com; spf=pass smtp.mailfrom=dovecot.org
  Authentication-Results: smtp.ptld.com;
dkim=fail reason="signature verification failed" (1024-bit key; secure) header.d=protonmail.ch [email protected] header.a=rsa-sha256 header.s=protonmail header.b=ivRoCAz3
  Received: from talvi.dovecot.org (localhost.localdomain [127.0.0.1])
      by talvi.dovecot.org (Postfix) with ESMTP id 3862D32297F;
      Fri, 13 Aug 2021 19:46:41 +0300 (EEST)
  X-Original-To: [email protected]
  Delivered-To: [email protected]
  Received: from mail-41113.protonmail.ch (mail-41113.protonmail.ch
      [185.70.41.113])
      by talvi.dovecot.org (Postfix) with ESMTPS id 07C532E9ADB
      for <[email protected]>; Fri, 13 Aug 2021 19:46:37 +0300 (EEST)
  Date: Fri, 13 Aug 2021 16:46:34 +0000
  DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=protonmail.ch;
      s=protonmail; t=1628873196;
      bh=HCYF6+sDiqNN6f9T2srf/HEjnr5eJacuoNxBWXk1XJA=;
      h=Date:To:From:Cc:Reply-To:Subject:In-Reply-To:References:From;
b=ivRoCAz3tXqh7Rk7Orxq6sdNGdIZ8eir4AX6OGxorOOza+XFOLQfBBIp4LfFEFV0y
      hV6b8z8gLmkZaEquwTyh+/Hx3lfpxts6Jvh1zpdL7YvahS2kOjSt0XikXulVgwvvxk
      BNmFxlLWwyVETRpgm5qsQHsNDjYb8HuYID4r1AXM=
  To: Aki Tuomi <[email protected]>
  From: Laura Smith <[email protected]>
Subject: Re: Undefined symbols (macOS Big Sur Intel) during compiling, update Message-ID: <tQIPhn9Wc9ZCxjWv-REC0bXuE3RgBI1H69xIL0TOnDj-kWvhZXEF7ZR6BevaNCeu8AG9Ypvd7gsnbMEZFAAIkvGmNM3y3UealzoYw9HZSCg=@protonmail.ch> In-Reply-To: <[email protected]> References: <ch2pr06mb6453c343867ecbfd79b73853bc...@ch2pr06mb6453.namprd06.prod.outlook.com> <ch2pr06mb6453d734b09c7d6d2d807787bc...@ch2pr06mb6453.namprd06.prod.outlook.com>
      <[email protected]>
  MIME-Version: 1.0
  Content-Type: text/plain; charset=utf-8
  Content-Transfer-Encoding: quoted-printable
X-Spam-Status: No, score=-1.2 required=10.0 tests=ALL_TRUSTED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,FREEMAIL_FROM shortcircuit=no
      autolearn=disabled version=3.4.4
  X-Spam-Checker-Version: SpamAssassin 3.4.4 (2020-01-24) on
      mailout.protonmail.ch
ARC-Seal: i=1; s=arc; d=dovecot.org; t=1628873197; a=rsa-sha256; cv=none; b=nuVCke6mta+nYIMyYvb2qRkTUyHSfKXEpp2vTds/ioq0kV4fyIL9oEON09yOoYcrQwci6D /EBrkZQI6nBjz592m7oslCjeNTcprIJr5QqLY6mJwW7mu+tp4rSEppIyD+r+9dbICExfFO p3j43c/m0J2acYc5pzZyJM7gLx/RBj2GURAUrP0JaX+y7moB/XQNPIJir2rE/jjNwojKCX keLRjlzOn7N4dLZxnKHgevDu6tH6gb0OzLPJO7W2IloMxdLZ/ab0PPZOj/M+BaYqnfa1Hs
      T4EvKhSwDjLyhjUQh7QTkmYm/FryVnIxEawEM+huOW9djJe7pIijuNFTqOR4Xg==
  ARC-Authentication-Results: i=1; talvi.dovecot.org;
dkim=pass header.d=protonmail.ch header.s=protonmail header.b=ivRoCAz3; spf=pass (talvi.dovecot.org: domain of [email protected]
      designates 185.70.41.113 as permitted sender)
      [email protected]
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=dovecot.org; s=arc; t=1628873197; h=from:from:reply-to:reply-to:subject:subject:date:date:
      message-id:message-id:to:to:cc:cc:mime-version:mime-version:
      content-type:content-type:
      content-transfer-encoding:content-transfer-encoding:
      in-reply-to:in-reply-to:references:references:dkim-signature;
      bh=HCYF6+sDiqNN6f9T2srf/HEjnr5eJacuoNxBWXk1XJA=;
b=EYR3Jyq5jrpho8glpLHD60ehlmLaGqrfdZepsfTTJtkjb0AkScBiUB0JX5hGbeyQCdeFvF zr0g/tfST7KEANMdZ0GK+rmwwSZC7LuKzszXWP+Pi5kBxsDPPU4BUivUkP3abCnGIixXfq LrEe+/bDrbMkM01wO8sJ0mZccYwURDMTJc7gFjcdSye+3FfKPZAvT9OG2aD2yQhtIVwpbv +Hg7P5v5Et/muT1E8NHZRBGOPhv4OZ/A2TcOLpafXejddNj2pRtVo8NlFzzT2PBn+KV49M
      nhI4ZDGk43l66nud7wMGDNdUcqYQl6CBQww+kC4ewfNbTy5D27wQwFzpVWGfFQ==
Cc: "[email protected]" <[email protected]>, Beosdoc <[email protected]>
  X-BeenThere: [email protected]
  X-Mailman-Version: 2.1.15
  Precedence: list
  List-Id: Dovecot Mailing List <dovecot.dovecot.org>
  List-Unsubscribe: <https://dovecot.org/mailman/options/dovecot>,
      <mailto:[email protected]?subject=unsubscribe>
  List-Archive: <https://dovecot.org/pipermail/dovecot/>
  List-Post: <mailto:[email protected]>
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  List-Subscribe: <https://dovecot.org/mailman/listinfo/dovecot>,
      <mailto:[email protected]?subject=subscribe>
  Reply-To: Laura Smith <[email protected]>
  Errors-To: [email protected]
  Sender: "dovecot" <[email protected]>

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