I have a VPS with CentOS 7 and DirectAdmin, and followed the DirectAdmin DKIM installation guide. This guide generated public and private key files for each domain under /etc/virtual/<domainname> and added the x._domainkey DNS records for all domains. The keys are identical across domains, which seems typical for a single DirectAdmin setup.
However, DKIM verification is only successful for one domain; the others are failing. All domains are configured with the correct DNS records and the keys are present under /etc/virtual/. Despite using various DKIM checking tools, the issue persists. Below are examples of emails sent to Gmail, one from a domain where DKIM passes and one from a domain where it fails.
PASSED
Code:
Delivered-To: myreceiving@email.com
Received: by 2002:a02:ce91:0:0:0:0:0 with SMTP id y17csp2268787jaq;
Thu, 20 Jun 2019 11:43:43 -0700 (PDT)
X-Google-Smtp-Source: APXvYqyHWv1IyFDou2UEbJDsI9lCO3ZPlvpivf+SDaxLWu/cMEnb84nA/g1V1peehYrxE8GyMn2W
X-Received: by 2002:adf:df10:: with SMTP id y16mr5120122wrl.302.1561056223289;
Thu, 20 Jun 2019 11:43:43 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1561056223; cv=none;
d=google.com; s=arc-20160816;
b=YGthbOIVg+Q8cdwD4QfD7hee1lXwGlZArgn6KWWoVadp7hpYSHEycZuQAW6+WqNLCF
G9h/1i5sSqO/grOs0Bus95lfwrjL4dt+PkcsutD6TcFntRK9mZPSiWWxdYwPys67wUOD
bUHqp5JACm/9qEteyJZ64NizIugYvXvZtvaEK2jBVkuP2GUIiF8I/shwYVL1Xx2nWTzm
xzXQ9U1LaBS1vyHD2PehKIDZ6dnB+PErHwH0HK9811yEcZJiHtlGvfomFiNZKBUZix/c
jUcc0Cr1E6DMs/b6+tftYe6ZjgJZ1ZK4Z7KvxuVXd1gC34TiaQ9vOsYyBD6R1mH0p3ue
N/ig==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
h=user-agent:message-id:organization:subject:to:from:date
:mime-version:dkim-signature;
bh=47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=;
b=T9/ZKb6Gf4vnAsVi7s9pAxnrwAHu8FiIPnQXoq/3+CYXvfxhqJLC9NUr4H1shrsHci
Tlzjpa0xomErl9bqHg/jNfkB2MQTD891U50F3UQqyCd4hGSW4t2qoEEphanaLOGCeb8q
y82B6nFlTlofbCCgyJT/m2NBtZd3mS9B5ePiE1uAAwTzSxmftAHgJy+QIyy/ARB1OU3j
DZj8L4hZDSy2MGDHtcOXCSPSlKzdcDWGQSVYnQOmLxtZceAb6VlmKunO2SBar6pW317b
iDsUx4YCzT3aXeBA+hXoFXavnvIbEF7V67oJH5Da5rZqQjq2GMkpiVvK4tHfc672aBGl
oUGw==
ARC-Authentication-Results: i=1; mx.google.com;
dkim=pass header.i=@solidewebservices.com header.s=x header.b=FI2O1Fs2;
spf=pass (google.com: domain of mypassingsending@email.com designates 212.237.233.121 as permitted sender) smtp.mailfrom=mypassingsending@email.com;
dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=solidewebservices.com
Return-Path: mypassingsending@email.com
Received: from 14a8e.k.vpssell.cloud (14a8e.k.vpssell.cloud. [212.237.233.121])
by mx.google.com with ESMTPS id h6si320983wrh.198.2019.06.20.11.43.42
for myreceiving@email.com
(version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128);
Thu, 20 Jun 2019 11:43:42 -0700 (PDT)
Received-SPF: pass (google.com: domain of mypassingsending@email.com designates 212.237.233.121 as permitted sender) client-ip=212.237.233.121;
Authentication-Results: mx.google.com;
dkim=pass header.i=@solidewebservices.com header.s=x header.b=FI2O1Fs2;
spf=pass (google.com: domain of mypassingsending@email.com designates 212.237.233.121 as permitted sender) smtp.mailfrom=mypassingsending@email.com;
dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=solidewebservices.com
DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=solidewebservices.com; s=x; h=Message-ID:Subject:To:From😃ate:MIME-Version: Sender:Reply-To:Cc:Content-Type:Content-Transfer-Encoding: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=47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=; b=FI2O1Fs2n3AJn8+tZNq98+ij7X AwzN0C9MEbz/+Ie9cF1GjJwlWJBmMIt9hSnGsqOIvY9tDh5+lO+hYQ30azEcUoVltTIKAXKzJLEkQ BlNOxRi5kiqoRQsa2Nz1hAuSuI3B+ON1/brd9hhi6qWEbbAOm71K5OjT1AUU09tlOwSuStwPQTyf/ dHNkFsxS8FdVIZGC5x5AZEgxvbR3I6AB46/e6tykWAagbb3JvhVlZp1d1/rQpiac3OaISc9oz4bSs 6Xmp9QqiuQ0NZ8gOVNmTqzQKkbY6Rp6PhJFpmUhMG6Jfok1+Htt//TNT4/08VCpWaGVnuVs+kxx1j UpYemNIw==;
Received: from localhost ([127.0.0.1] helo=14a8e.k.vpssell.cloud) by 14a8e.k.vpssell.cloud with esmtpa (Exim 4.92) (envelope-from mypassingsending@email.com) id 1he22A-0002dZ-Dl for myreceiving@email.com; Thu, 20 Jun 2019 20:43:42 +0200
MIME-Version: 1.0
Date: Thu, 20 Jun 2019 20:43:42 +0200
From: Solide Webservices mypassingsending@email.com
To: myreceiving@email.com
Subject: test
Organization: Solide Webservices
Message-ID: 24ff6b4d81fd481b604492cf75590c89@solidewebservices.com
X-Sender: mypassingsending@email.com
User-Agent: Roundcube Webmail/1.3.9
X-Authenticated-Id: mypassingsending@email.com
NOT PASSED
Code:
Delivered-To: myreceiving@email.com
Received: by 2002:a02:ce91:0:0:0:0:0 with SMTP id y17csp2343515jaq;
Thu, 20 Jun 2019 13:10:53 -0700 (PDT)
X-Google-Smtp-Source: APXvYqz+fIS4qGLW+hrfdsjyrObjYJbYiY/aeD1AeuV1QVj4UdQmLRuwTy3MrSQ9r5vN3t0qCSLn
X-Received: by 2002:a5d:4703:: with SMTP id y3mr34728943wrq.35.1561061453625;
Thu, 20 Jun 2019 13:10:53 -0700 (PDT)
ARC-Seal: i=1; a=rsa-sha256; t=1561061453; cv=none;
d=google.com; s=arc-20160816;
b=FFDByHJnnHPgtnFoMi/1dA0/05Hg7kRgcWoHh40n/XgkimjHJwmiebPm5vkBuH+F+j
nH7DcAvwWJtYtAGkN/oDoHxhef4Nps0NqRHG+ib4l5ewcE+iLjW7U/pPyZQs05iYyyWJ
LmOtYjUXSBKxyKqTKetuItHTeKZ9HKS39+Wl1EpCoLQ/lT+imwhQGWxO0pvyYXwBXkvM
ebYl8et1W1BCScdgO0wSbSbIuuRJJtfRV4NY6UfUICTFXHkOJYGJ3ml/EVVhGecxhID4
gPPgdh0XEj93Qq89ywbSRmEni+HzKIz9+bzLu30Bv6QpH7VxjRZzuhg5KnoAY6NJqev2
eoEw==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816;
h=user-agent:message-id:subject:to:from:date:mime-version
:dkim-signature;
bh=47DEQpj8HBSa+/TImW+5JCeuQeRkm5NMpJWZG3hSuFU=;
b=hkvw342b7xF58oUmSGPkjH7SgSQ3LwQJCzdRYOMc/UHhUpbR4qfwqXthn91pgoKpCQ
h6MHNQloNkVWc27BfU5gbqTB19HJMqxtXh4xVFsplY1OItm+zAmIuVgn2yX7mnBs9hvE
+xverurh7q2K7n4Slg9bszBnU1yFRqn+njfVYcWqiPi4Zp8YItavWQEa2Z9xWwkuA8Zy
3WylUZK3e1weYNPskawQ0FaqYbYA0/XRa8FBqU8FwyWlL/F9J1npd8+Gg8JnNi+NVjgm
0OiNRIf3nzXw//VS8eNOK0FpPNRxvt3aTLX1IX3p3EtSVbpc7kBkkRmO/ROrml7uoIL0
tTBg==
ARC-Authentication-Results: i=1; mx.google.com;
dkim=fail header.i=@jelger-en-leonie.info header.s=x header.b=P4Jz89OE;
spf=pass (google.com: domain of myfailingsending@email.com designates 212.237.233.121 as permitted sender) smtp.mailfrom=myfailingsending@email.com;
dmarc=pass (p=QUARANTINE sp=QUARANTINE dis=NONE) header.from=jelger-en-leonie.info
Return-Path: myfailingsending@email.com
Received: from 14a8e.k.vpssell.cloud (14a8e.k.vpssell.cloud. [212.237.233.121])
