Mijn mail-client checkt DKIM-headers. De notificatiemail van het synology-forum geeft dkim=fail reason="key not found in DNS". Het lijkt me wel netjes hier iets aan te doen!
Hier de headers uit de source van de mail:
Return-Path: <u19096p14273[member=13822]Synology[/member]-forum.nl>
X-Original-To: xxx@xxx
Delivered-To: xxx@xxx
Received-SPF: none (synology-forum.nl: No applicable sender policy available) receiver=mainserver; identity=mailfrom; envelope-from="u19096p14273[member=13822]Synology[/member]-forum.nl"; helo=web0116.zxcs.nl; client-ip=185.104.29.76
Authentication-Results: xxx.com; dmarc=none (p=none dis=none) header.from=synology-forum.nl
Authentication-Results: xxx.com;
dkim=fail reason="key not found in DNS" (0-bit key) header.d=synology-forum.nl header.i=[member=13822]Synology[/member]-forum.nl header.b=hq3tFoUG
Received: from web0116.zxcs.nl (web0116.zxcs.nl [185.104.29.76])
(using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits))
(No client certificate requested)
by xxx.com (Postfix) with ESMTPS id 2611A4DB3F2
for <xxx@xxx>; Sat, 1 Feb 2020 16:34:43 +0100 (CET)
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed;
d=synology-forum.nl; s=x; h=Content-Transfer-Encoding:Content-Type:
Mime-Version:Message-ID:Date:From:Subject:To:Sender:Reply-To:Cc:Content-ID:
Content-Description:Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc
:Resent-Message-ID:In-Reply-To:References:List-Id:List-Help:List-Unsubscribe:
List-Subscribe:List-Post:List-Owner:List-Archive;
bh=CAXfjI5Ubl0GLlIWjwmRhbOc4TapgMHGW27jcYvVwQI=; b=hq3tFoUGl5zPFN5FTSiui+qs8O
SLkdVxxb4BT4iwtMyO3glyJZphZfNJZMuUQtHFXmxltKARrKPiZwZvq1I3DZWFy1qRs2HmwfFe+uf
xhdftgtqkxLDbzxtuomC0O2WRNlZ0F8TbdKHlrn1qkLdLtbdm0gC7eObmKGgFOjt2xCnPxFXBK/bk
j5+ci+v4XdrSnTNDTkO6PZG8Pif2p+x3XT122HsobX1Q49PuLhedOoeRcJh7A7k6mYog6wBH0GbBf
xlzZB6AlbGke5R7JjA1dPw4nEVdOewinkZx+Oz9+Msxi7v17j0B5y2pDfmFbxi37iFqlxY/H9w/sI
rmXN6o2w==;
Received: from u19096p14273 by web0116.zxcs.nl with local (Exim 4.92.3)
(envelope-from <u19096p14273[member=13822]Synology[/member]-forum.nl>)
id 1ixunC-000oAb-RN
for xxx@xxx; Sat, 01 Feb 2020 16:34:43 +0100
To: xxx@xxx
Subject: Topic gesloten: Administrator reset gebruikers password
X-PHP-Script: www.synology-forum.nl/index.php for 217.121.148.245
X-PHP-Filename: /home/u19096p14273/domains/synology-forum.nl/private_html/index.php REMOTE_ADDR: 217.121.148.245
X-PHP-Originating-Script: 512:Subs-Post.php
From: "Synology-Forum.nl" <noreply[member=13822]Synology[/member]-forum.nl>
Date: Sat, 01 Feb 2020 15:34:42 -0000
Message-ID: <40159875cfcdc0d6e92ba01f780c404f-m280266[member=13822]Synology[/member]-forum.nl>
X-Mailer: SMF
Mime-Version: 1.0
Content-Type: multipart/alternative; boundary="SMF-f089361830b731108167cd4a6f0df358"
Content-Transfer-Encoding: 7bit
X-Authenticated-Id: u19096p14273
X-MailScanner-ID: 2611A4DB3F2.A3A0B
X-MailScanner: Found to be clean
X-MailScanner-From: u19096p14273[member=13822]Synology[/member]-forum.nl
X-Spam-Status: No
Ik weet niet meer precies hoe het werkt, maar er zou een geldige DKIM-key moeten zitten in een mail die van het forum komt, en die is niet aangetroffen.
[Mod edit: persoonlijke info uit header gehaald]