DKIM Fails (body hash) when signing at MTA using opendkim
We are running into trouble with signing our outgoing mailings with DKIM using opendkim as a filter for Postfix.
This issue only occurs when sending HTML emails from phpList. All other text mailings and mailings from other services sign correctly and verify. phpList uses phpMailer as the engine.
If we send the mailing as "text", then we have no problem. If we send the mailing as "HTML" then body hash fails.
This problem existed in v2, however we used to force phpList to ONLY send as HTML.
This error occurs when sending the message as a joint HTML and TEXT email (which is the default in v3).
I presume it's something to do with line breaks/returns.
Can somebody point us in the right direction?
Thanks for your help in advance.
Port25 verifier service - a message that passes DKIM (Text only)
==========================================================
Summary of Results
==========================================================
SPF check: pass
DomainKeys check: neutral
DKIM check: pass
Sender-ID check: pass
SpamAssassin check: ham
==========================================================
Details:
==========================================================
----------------------------------------------------------
DomainKeys check details:
----------------------------------------------------------
Result: neutral (message not signed)
ID(s) verified: [email protected]
DNS record(s):
----------------------------------------------------------
DKIM check details:
----------------------------------------------------------
Result: pass (matches From: [email protected])
ID(s) verified: header.d=flyawaysimulation.com
Canonicalized Headers:
to:[email protected]'0D''0A'
subject:Test'20'123'0D''0A'
date:Thu,'20'18'20'Sep'20'2014'20'21:50:35'20'+0100'0D''0A'
from:Fly'20'Away'20'Simulation'20'<[email protected]>'0D''0A'
reply-to:Fly'20'Away'20'Simulation'20'<[email protected]>'0D''0A'
list-help:<https://flyawaysimulation.com/lists/?p=preferences&uid=1e629246241f8e9714134ee8076ad406>'0D''0A'
list-unsubscribe:<https://flyawaysimulation.com/lists/?p=unsubscribe&uid=1e629246241f8e9714134ee8076ad406&jo=1>'0D''0A'
list-subscribe:<https://flyawaysimulation.com/lists/?p=subscribe>'0D''0A'
list-owner:<mailto:[email protected]>'0D''0A'
dkim-signature:v=1;'20'a=rsa-sha256;'20'c=relaxed/simple;'20'd=flyawaysimulation.com;'20's=mail;'20't=1411073436;'20'bh=hhSjWh2jttCh3y1SOIZzUVlxN+KYTuNZ+eh16bzchHc=;'20'h=To:Subject:Date:From:Reply-To:List-Help:List-Unsubscribe:'20'List-Subscribe:List-Owner;'20'b=
Canonicalized Body:
'20'test'20'123'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
'20''20''0D''0A'
DNS record(s):
mail._domainkey.flyawaysimulation.com. 3600 IN TXT "v=DKIM1;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDimrx9MV1sFyUCVPeH6SFMBy7Cb2AU6aB9i3GazP7QKWG5pWWkFEurFImNbwi4wKz6dtKQeEkcGzPdzyeD+hXaSG2sl86T4pnwIxUaBMlW+FWfaNx0XPphacPAYjtkJGVoZGmmIbK3tH8HLZqdCEy6YIKd0kNSXQqFEMQseHaR6wIDAQAB"
Public key used for verification: mail._domainkey.flyawaysimulation.com (1024 bits)
NOTE: DKIM checking has been performed based on the latest DKIM specs
(RFC 4871 or draft-ietf-dkim-base-10) and verification may fail for
older versions. If you are using Port25's PowerMTA, you need to use
version 3.2r11 or later to get a compatible version of DKIM.
==========================================================
Original Email
==========================================================
Return-Path: <[email protected]>
Received: from web3.rbftpnetworks.net (195.224.144.101) by verifier.port25.com id h3d2q211u9cu for <[email protected]>; Thu, 18 Sep 2014 16:50:41 -0400 (envelope-from <[email protected]>)
Authentication-Results: verifier.port25.com; spf=pass [email protected]
Authentication-Results: verifier.port25.com; domainkeys=neutral (message not signed) [email protected]
Authentication-Results: verifier.port25.com; dkim=pass (matches From: [email protected]) header.d=flyawaysimulation.com
Authentication-Results: verifier.port25.com; sender-id=pass [email protected]
Received: by web3.rbftpnetworks.net (Postfix, from userid 70)
id 2FF6D3E2B4BC; Thu, 18 Sep 2014 21:50:35 +0100 (BST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple;
d=flyawaysimulation.com; s=mail; t=1411073436;
bh=hhSjWh2jttCh3y1SOIZzUVlxN+KYTuNZ+eh16bzchHc=;
h=To:Subject:Date:From:Reply-To:List-Help:List-Unsubscribe:
List-Subscribe:List-Owner;
b=kz3pyKnsxvzKKc9I764d8xwTxMQkJNcdHSup9+BOoNujSXTOyyAM1tpc5QWIhGMa4
NOwsePDv5qfladW3kAh7TuwWW9geH6gdV9PhHF5RCg6jyHHbUY8t4mpIcW7w4yNuIK
BMMbXk4+puGpEKdyRgfGKXxYjI0bVKK1Ck2vdb5Q=
To: [email protected]
Subject: Test 123
Received: from host81-138-131-190.in-addr.btopenworld.com [81.138.131.190] by flyawaysimulation.com with HTTP; Thu, 18 Sep 2014 21:50:35 +0100
Date: Thu, 18 Sep 2014 21:50:35 +0100
From: Fly Away Simulation <[email protected]>
Reply-To: Fly Away Simulation <[email protected]>
Message-ID: <[email protected]>
X-Priority: 3
X-Mailer: PHPMailer 5.2.5 (https://github.com/Synchro/PHPMailer/)
X-phpList-version: 3.0.7
X-MessageID: 8
X-ListMember: [email protected]
Precedence: bulk
Bounces-To: [email protected]
List-Help: <https://flyawaysimulation.com/lists/?p=preferences&uid=1e629246241f8e9714134ee8076ad406>
List-Unsubscribe: <https://flyawaysimulation.com/lists/?p=unsubscribe&uid=1e629246241f8e9714134ee8076ad406&jo=1>
List-Subscribe: <https://flyawaysimulation.com/lists/?p=subscribe>
List-Owner: <mailto:[email protected]>
MIME-Version: 1.0
Content-Transfer-Encoding: 8bit
Content-Type: text/plain; charset=UTF-8
test 123
Port25 verifier service - a message that fails DKIM (Text/HTML email)
==========================================================
Summary of Results
==========================================================
SPF check: pass
DomainKeys check: neutral
DKIM check: fail
Sender-ID check: pass
SpamAssassin check: ham
==========================================================
Details:
==========================================================
----------------------------------------------------------
DKIM check details:
----------------------------------------------------------
Result: fail (wrong body hash: expected nb2kCq5nNBE+IfyLiAIH9t/9x7Kk5PpCb+1GdO/wiJ8=)
ID(s) verified:
Canonicalized Headers:
to:[email protected]'0D''0A'
subject:Test'20'123'0D''0A'
date:Thu,'20'18'20'Sep'20'2014'20'21:52:19'20'+0100'0D''0A'
from:Fly'20'Away'20'Simulation'20'<[email protected]>'0D''0A'
reply-to:Fly'20'Away'20'Simulation'20'<[email protected]>'0D''0A'
list-help:<https://flyawaysimulation.com/lists/?p=preferences&uid=1e629246241f8e9714134ee8076ad406>'0D''0A'
list-unsubscribe:<https://flyawaysimulation.com/lists/?p=unsubscribe&uid=1e629246241f8e9714134ee8076ad406&jo=1>'0D''0A'
list-subscribe:<https://flyawaysimulation.com/lists/?p=subscribe>'0D''0A'
list-owner:<mailto:[email protected]>'0D''0A'
dkim-signature:v=1;'20'a=rsa-sha256;'20'c=relaxed/simple;'20'd=flyawaysimulation.com;'20's=mail;'20't=1411073540;'20'bh=XMTdnEvx/N4aZB10KoQqWOQW+MUVFvU66kqiSqm0XKc=;'20'h=To:Subject:Date:From:Reply-To:List-Help:List-Unsubscribe:'20'List-Subscribe:List-Owner;'20'b=
Canonicalized Body:
--b1_b4a02db1226bc348457a47d51e902619'0D''0A'
Content-Type:'20'text/plain;'20'charset=UTF-8'0D''0A'
Content-Transfer-Encoding:'20'quoted-printable'0D''0A'
'0D''0A'
'20'test'20'123'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
'20'=20'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
--b1_b4a02db1226bc348457a47d51e902619'0D''0A'
Content-Type:'20'text/html;'20'charset=UTF-8'0D''0A'
Content-Transfer-Encoding:'20'quoted-printable'0D''0A'
'0D''0A'
<html><head>=0A'20''20''20''20''20''20''20''20'<meta'20'content=3D"text/html;charset=3DUTF-8"'20'http-equ='0D''0A'
'0D''0A'
iv=3D"Content-Type">=0A'20''20''20''20''20''20''20''20'<title></title></head><body><p> test'20'12='0D''0A'
'0D''0A'
3</p>=0A<img'20'src=3D"https://flyawaysimulation.com/lists/ut.php?u=3D1e629246='0D''0A'
'0D''0A'
241f8e9714134ee8076ad406&m=3D8"'20'width=3D"1"'20'height=3D"1"'20'border=3D"0"'20'/='0D''0A'
'0D''0A'
></body></html>'0D''0A'
'0D''0A'
'0D''0A'
--b1_b4a02db1226bc348457a47d51e902619--'0D''0A'
DNS record(s):
NOTE: DKIM checking has been performed based on the latest DKIM specs
(RFC 4871 or draft-ietf-dkim-base-10) and verification may fail for
older versions. If you are using Port25's PowerMTA, you need to use
version 3.2r11 or later to get a compatible version of DKIM.
==========================================================
Original Email
==========================================================
Return-Path: <[email protected]>
Received: from web3.rbftpnetworks.net (195.224.144.101) by verifier.port25.com id h3d30c11u9cb for <[email protected]>; Thu, 18 Sep 2014 16:52:22 -0400 (envelope-from <[email protected]>)
Authentication-Results: verifier.port25.com; spf=pass [email protected]
Authentication-Results: verifier.port25.com; domainkeys=neutral (message not signed) [email protected]
Authentication-Results: verifier.port25.com; dkim=fail (wrong body hash: expected nb2kCq5nNBE+IfyLiAIH9t/9x7Kk5PpCb+1GdO/wiJ8=)
Authentication-Results: verifier.port25.com; sender-id=pass [email protected]
Received: by web3.rbftpnetworks.net (Postfix, from userid 70)
id 014C83E2B53F; Thu, 18 Sep 2014 21:52:19 +0100 (BST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple;
d=flyawaysimulation.com; s=mail; t=1411073540;
bh=XMTdnEvx/N4aZB10KoQqWOQW+MUVFvU66kqiSqm0XKc=;
h=To:Subject:Date:From:Reply-To:List-Help:List-Unsubscribe:
List-Subscribe:List-Owner;
b=OXitjsekFORKng9NPtJ7GSrKROUf+EGj/zetZ7ZoXWGeZerr2+IUNFgSZcNPjub5M
VazJtwOMRZ5g7r6SrUWjPfkpDH6nt3qecOW2E000ftsWwv78wPtD4mc0OIN/IsY52h
vk+mbHrQb4ToUHmxIGRIfB/NOdDiXG7Gp+aVrgRY=
To: [email protected]
Subject: Test 123
Received: from host81-138-131-190.in-addr.btopenworld.com [81.138.131.190] by flyawaysimulation.com with HTTP; Thu, 18 Sep 2014 21:52:19 +0100
Date: Thu, 18 Sep 2014 21:52:19 +0100
From: Fly Away Simulation <[email protected]>
Reply-To: Fly Away Simulation <[email protected]>
Message-ID: <[email protected]>
X-Priority: 3
X-Mailer: PHPMailer 5.2.5 (https://github.com/Synchro/PHPMailer/)
X-phpList-version: 3.0.7
X-MessageID: 8
X-ListMember: [email protected]
Precedence: bulk
Bounces-To: [email protected]
List-Help: <https://flyawaysimulation.com/lists/?p=preferences&uid=1e629246241f8e9714134ee8076ad406>
List-Unsubscribe: <https://flyawaysimulation.com/lists/?p=unsubscribe&uid=1e629246241f8e9714134ee8076ad406&jo=1>
List-Subscribe: <https://flyawaysimulation.com/lists/?p=subscribe>
List-Owner: <mailto:[email protected]>
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="b1_b4a02db1226bc348457a47d51e902619"
--b1_b4a02db1226bc348457a47d51e902619
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
test 123
=20
--b1_b4a02db1226bc348457a47d51e902619
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
<html><head>=0A <meta content=3D"text/html;charset=3DUTF-8" http-equ=
iv=3D"Content-Type">=0A <title></title></head><body><p> test 12=
3</p>=0A<img src=3D"https://flyawaysimulation.com/lists/ut.php?u=3D1e629246=
241f8e9714134ee8076ad406&m=3D8" width=3D"1" height=3D"1" border=3D"0" /=
> </body></html>
--b1_b4a02db1226bc348457a47d51e902619--
phpMailer version 5.2.5 (packaged with phpList)
UPDATE: We can pass the DKIM verification check on Port25's tester if we enable "FixCRLF yes" in the opendkim config. However, this still FAILS Gmail DKIM verification.
Test output of passed message with "FixCRLF yes":
==========================================================
Summary of Results
==========================================================
SPF check: pass
DomainKeys check: neutral
DKIM check: pass
Sender-ID check: pass
SpamAssassin check: ham
----------------------------------------------------------
DomainKeys check details:
----------------------------------------------------------
Result: neutral (message not signed)
ID(s) verified: [email protected]
DNS record(s):
----------------------------------------------------------
DKIM check details:
----------------------------------------------------------
Result: pass (matches From: [email protected])
ID(s) verified: header.d=flyawaysimulation.com
Canonicalized Headers:
to:[email protected]'0D''0A'
subject:Test'20'123'0D''0A'
date:Sun,'20'21'20'Sep'20'2014'20'15:57:46'20'+0100'0D''0A'
from:Fly'20'Away'20'Simulation'20'<[email protected]>'0D''0A'
reply-to:Fly'20'Away'20'Simulation'20'<[email protected]>'0D''0A'
list-help:<https://flyawaysimulation.com/lists/?p=preferences&uid=1e629246241f8e9714134ee8076ad406>'0D''0A'
list-unsubscribe:<https://flyawaysimulation.com/lists/?p=unsubscribe&uid=1e629246241f8e9714134ee8076ad406&jo=1>'0D''0A'
list-subscribe:<https://flyawaysimulation.com/lists/?p=subscribe>'0D''0A'
list-owner:<mailto:[email protected]>'0D''0A'
dkim-signature:v=1;'20'a=rsa-sha256;'20'c=relaxed/simple;'20'd=flyawaysimulation.com;'20's=mail;'20't=1411311466;'20'bh=PUR9ib4HOSSj9G3jmXSCyzc1LAtqQeyWPSAii67TLd8=;'20'h=To:Subject:Date:From:Reply-To:List-Help:List-Unsubscribe:'20'List-Subscribe:List-Owner;'20'b=
Canonicalized Body:
--b1_4ecb49f93b720bc688fe3bcdcafed5b0'0D''0A'
Content-Type:'20'text/plain;'20'charset=UTF-8'0D''0A'
Content-Transfer-Encoding:'20'quoted-printable'0D''0A'
'0D''0A'
'20'test'20'123'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
'20'=20'0D''0A'
'0D''0A'
'0D''0A'
'0D''0A'
--b1_4ecb49f93b720bc688fe3bcdcafed5b0'0D''0A'
Content-Type:'20'text/html;'20'charset=UTF-8'0D''0A'
Content-Transfer-Encoding:'20'quoted-printable'0D''0A'
'0D''0A'
<html><head>=0A'20''20''20''20''20''20''20''20'<meta'20'content=3D"text/html;charset=3DUTF-8"'20'http-equ='0D''0A'
'0D''0A'
iv=3D"Content-Type">=0A'20''20''20''20''20''20''20''20'<title></title></head><body><p> test'20'12='0D''0A'
'0D''0A'
3</p>=0A<img'20'src=3D"https://flyawaysimulation.com/lists/ut.php?u=3D1e629246='0D''0A'
'0D''0A'
241f8e9714134ee8076ad406&m=3D8"'20'width=3D"1"'20'height=3D"1"'20'border=3D"0"'20'/='0D''0A'
'0D''0A'
></body></html>'0D''0A'
'0D''0A'
'0D''0A'
--b1_4ecb49f93b720bc688fe3bcdcafed5b0--'0D''0A'
DNS record(s):
mail._domainkey.flyawaysimulation.com. 3600 IN TXT "v=DKIM1;p=MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDimrx9MV1sFyUCVPeH6SFMBy7Cb2AU6aB9i3GazP7QKWG5pWWkFEurFImNbwi4wKz6dtKQeEkcGzPdzyeD+hXaSG2sl86T4pnwIxUaBMlW+FWfaNx0XPphacPAYjtkJGVoZGmmIbK3tH8HLZqdCEy6YIKd0kNSXQqFEMQseHaR6wIDAQAB"
Public key used for verification: mail._domainkey.flyawaysimulation.com (1024 bits)
NOTE: DKIM checking has been performed based on the latest DKIM specs
(RFC 4871 or draft-ietf-dkim-base-10) and verification may fail for
older versions. If you are using Port25's PowerMTA, you need to use
version 3.2r11 or later to get a compatible version of DKIM.
==========================================================
Original Email
==========================================================
Return-Path: <[email protected]>
Received: from web3.rbftpnetworks.net (195.224.144.101) by verifier.port25.com id h3rjmm11u9c1 for <[email protected]>; Sun, 21 Sep 2014 10:57:47 -0400 (envelope-from <[email protected]>)
Authentication-Results: verifier.port25.com; spf=pass [email protected]
Authentication-Results: verifier.port25.com; domainkeys=neutral (message not signed) [email protected]
Authentication-Results: verifier.port25.com; dkim=pass (matches From: [email protected]) header.d=flyawaysimulation.com
Authentication-Results: verifier.port25.com; sender-id=pass [email protected]
Received: by web3.rbftpnetworks.net (Postfix, from userid 70)
id CDAD13E6DCB8; Sun, 21 Sep 2014 15:57:46 +0100 (BST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple;
d=flyawaysimulation.com; s=mail; t=1411311466;
bh=PUR9ib4HOSSj9G3jmXSCyzc1LAtqQeyWPSAii67TLd8=;
h=To:Subject:Date:From:Reply-To:List-Help:List-Unsubscribe:
List-Subscribe:List-Owner;
b=skviRyhjPtB8aaRzLKyzkjay3Qk+Z5AOGg4Ue/Dk62SgvP1aZnf3kL1lCSWiwO1rI
VKYmMzzspbKLxMVrZ0yXO0s4wx5u9EFNw4eJMNh6fKCimiNwEoSGQRkJcjNb7wA9nG
38/FjbPIkvRyx1+hxgL9QOP3iSGv9w3X0UAFUmmc=
To: [email protected]
Subject: Test 123
Received: from host81-138-131-190.in-addr.btopenworld.com [81.138.131.190] by flyawaysimulation.com with HTTP; Sun, 21 Sep 2014 15:57:46 +0100
Date: Sun, 21 Sep 2014 15:57:46 +0100
From: Fly Away Simulation <[email protected]>
Reply-To: Fly Away Simulation <[email protected]>
Message-ID: <[email protected]>
X-Priority: 3
X-Mailer: PHPMailer 5.2.5 (https://github.com/Synchro/PHPMailer/)
X-phpList-version: 3.0.7
X-MessageID: 8
X-ListMember: [email protected]
Precedence: bulk
Bounces-To: [email protected]
List-Help: <https://flyawaysimulation.com/lists/?p=preferences&uid=1e629246241f8e9714134ee8076ad406>
List-Unsubscribe: <https://flyawaysimulation.com/lists/?p=unsubscribe&uid=1e629246241f8e9714134ee8076ad406&jo=1>
List-Subscribe: <https://flyawaysimulation.com/lists/?p=subscribe>
List-Owner: <mailto:[email protected]>
MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="b1_4ecb49f93b720bc688fe3bcdcafed5b0"
--b1_4ecb49f93b720bc688fe3bcdcafed5b0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
test 123
=20
--b1_4ecb49f93b720bc688fe3bcdcafed5b0
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
<html><head>=0A <meta content=3D"text/html;charset=3DUTF-8" http-equ=
iv=3D"Content-Type">=0A <title></title></head><body><p> test 12=
3</p>=0A<img src=3D"https://flyawaysimulation.com/lists/ut.php?u=3D1e629246=
241f8e9714134ee8076ad406&m=3D8" width=3D"1" height=3D"1" border=3D"0" /=
> </body></html>
--b1_4ecb49f93b720bc688fe3bcdcafed5b0--
Same message sent to Gmail:
Delivered-To: ****
Received: by 10.170.191.196 with SMTP id i187csp139225yke;
Sun, 21 Sep 2014 08:05:20 -0700 (PDT)
X-Received: by 10.194.134.100 with SMTP id pj4mr14856269wjb.72.1411311920538;
Sun, 21 Sep 2014 08:05:20 -0700 (PDT)
Return-Path: <[email protected]>
Received: from web3.rbftpnetworks.net (web3.rbftpnetworks.net. [195.224.144.101])
by mx.google.com with ESMTP id db4si8324616wib.100.2014.09.21.08.05.20
for <****>;
Sun, 21 Sep 2014 08:05:20 -0700 (PDT)
Received-SPF: pass (google.com: domain of [email protected] designates 195.224.144.101 as permitted sender) client-ip=195.224.144.101;
Authentication-Results: mx.google.com;
spf=pass (google.com: domain of [email protected] designates 195.224.144.101 as permitted sender) [email protected];
dkim=neutral (body hash did not verify) header.i=@
Received: by web3.rbftpnetworks.net (Postfix, from userid 70)
id E11B93E6E003; Sun, 21 Sep 2014 16:05:18 +0100 (BST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple;
d=flyawaysimulation.com; s=mail; t=1411311919;
bh=d40fzjdg7KnEX5wH3Ea2b1ZzoQMu8dzZyP1dYsxaoVc=;
h=To:Subject:Date:From:Reply-To:List-Help:List-Unsubscribe:
List-Subscribe:List-Owner;
b=ub2LA6uRxpsgByD3RRUHqAGhlUu5d1gBgNadBBeaJdDP6pvSL/IX2Lzy6SqG2kGIK
dU7YnOmI3w0frerJZRldlSAZduKUQqaT0QZHfvUZVJnLihK8EIZ7GkzX+6VVE2Pojm
J8aVCq8fPOEuCG6mu2QdIUmpqkWO+s8bBYBYR6ro=
To: *****
Subject: Test 123
Received: from host81-138-131-190.in-addr.btopenworld.com [81.138.131.190] by flyawaysimulation.com with HTTP; Sun, 21 Sep 2014 16:05:18 +0100
Date: Sun, 21 Sep 2014 16:05:18 +0100
From: Fly Away Simulation <[email protected]>
Reply-To: Fly Away Simulation <[email protected]>
Message-ID: <[email protected]>
X-Priority: 3
X-Mailer: PHPMailer 5.2.5 (https://github.com/Synchro/PHPMailer/)
X-phpList-version: 3.0.7
X-MessageID: 8
X-ListMember: ****
Precedence: bulk
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MIME-Version: 1.0
Content-Type: multipart/alternative;
boundary="b1_8938d7bccca9e15cd846714ca4a01d04"
--b1_8938d7bccca9e15cd846714ca4a01d04
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
test 123
=20
--b1_8938d7bccca9e15cd846714ca4a01d04
Content-Type: text/html; charset=UTF-8
Content-Transfer-Encoding: quoted-printable
<html><head>=0A <meta content=3D"text/html;charset=3DUTF-8" http-equ=
iv=3D"Content-Type">=0A <title></title></head><body><p> test 12=
3</p>=0A<img src=3D"https://flyawaysimulation.com/lists/ut.php?u=3D58f4e3c3=
8a321901b99d714dd5f54850&m=3D8" width=3D"1" height=3D"1" border=3D"0" /=
></body></html>
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Answer
I ran into the exact problem you are describing where [PlainText DKIM=pass] and [HTMLBody DKIM=fail] when sending to Gmail. I'm using C# MailMessage and by default the body default character set is "us-ascii", which works fine for Text based emails, but not HTML ones. Default character set for Email Subject is UTF-8, so no need to set again.
When sending a HTML Email, you have to code the following parameter before sending:
Mailmessage.BodyEncoding = Encoding.UTF8;
After making this small change, Gmail registers my emails again and I receive a DKIM=pass; when I view the original source. Also these are the relevant headers
MIME-Version: 1.0
Content-Type: text/html; charset=utf-8
Content-Transfer-Encoding: base64
*followed by block of base64 body text*
Perhaps you can mimic the behavior using PHP, and maybe change yours from
Content-Transfer-Encoding: quoted-printable
to
Content-Transfer-Encoding: base64