Mdameon Sender Rewriting Scheme | MDaemon Technologies, Ltd.
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Mdameon Sender Rewriting Scheme

  • O

    Hi,

    I'm wondering if Mdaemon is supports SRS ? I have a problem with SPF alignement when I'm forwarding emails to Gmail. 
    let me explain, In digram below:

    ORIGINAL SERVER (DOMAIN X.tld ) ------> MDAEMON  (Y.tld) -------> GMAIL 

    MDAEMON puts someone@y.tld   in " Return-Path: " and not the someone@x.tld which makes the problem when Gmail want's to verify SPF alignement. 

    Thanks in advance for your help and clarification. 

    0 likes
  • A

    MDaemon does not support SRS, however there are two options to address this.

    1. Enable the option to use the local address in the SMTP envelope when forwarding messages (Security | Sender Authentication | SPF Verification)

    2. Sign outbound messages with ARC.  (Security | Sender Authentication | ARC Settings)

     

    --
    Arron Caruth

  • O

    Dear Arron,

    Thanks for your reply. 

    1. I noticed this option and as I checked it is working exactly as SRS. I sent a test message to be forwarded and noticed this in the headers:

    Return-Path: <prvs=14131e0b8c=someone@y.tld>

    It means this option somehow rewrites Return-Path in the header which is great. The problem is this is not hapenning all the time which is wiered. 

    2. ARC is a great option too but it's not completely related to SPF alignement. 

    I'm just wondering is there a specific reason that you don't want to implement SRS in the MDAEMON or because it is not mandatory. 

    Regards

     

    0 likes
  • A

    The prvs= value is likely added by BATV, not the SPF option to use a local address in the SMTP envelope.  The option to use the local address in the SMTP envelope will cause MDaemon to use the address that is forwarding the message in the SMTP envelope instead of the email address of the original sender.

    From the help file:

    Use local address in SMTP envelope when forwarding messages

    Enable this option if you want all mail forwarded by MDaemon to use a local address in the SMTP envelope. This helps reduce problems associated with forwarding. Normally, forwarded messages are sent using the email address of the original sender and not the email address that is actually doing the forwarding. In some situations, using a local address may be necessary in order to prevent the receiving server from falsely identifying the forwarded message as having a "spoofed" address. This option is enabled by default.

    You are correct, ARC is not completely related to SPF. It provides a means of preserving authentication results when a message is forwarded.  This includes any authentication results that are included in the Authentication-Results header, such as SMTP Authentication, Reverse Lookups, SPF, DKIM, and DMARC results.

    More Info from the help file:

    Authenticated Received Chain (ARC) is an email authentication protocol that lets intermediate mail servers digitally sign a message's authentication results. It provides an authenticated "chain of custody" for a message, allowing each server that handles the message to see what previous servers handled it and whether or not it was authenticated at each step. When a downstream mail server does DMARC verification and finds that SPF or DKIM have failed (due to forwarding or mailing list modifications, for example), it can look for ARC results from a trusted server and use them to decide whether to accept the message.

    --
    Arron Caruth

  • O

    Dear Arron,

    Thanks for your great explanations. I noticed a wiered problem on forwarding behaviour of Mdaemon (I'm testing v25.5.1) , Mdaemon hosted account acts as forwarder to external address (Gmail in my test) it is working completely fine only if it contains no attachement. DKIM is failing in presence of attachement in forwarded emails. Can you help me what is chaning in email body hash during forward procedure in Mdaemon and how to solve this? 

    X@GMAIL.com  ------>  MDAEMON  -------> Y@GMAIL.COM 

    0 likes
  • A

    I haven't been able to reproduce an issue.  Where are you seeing the DKIM failure?  Can you post a screen shot?

    Does the same issue occur if you send from a@notgmail.com ----> MDAEMMON ----> y@gmail.com?

    Can you also post a copy of the MSG file that was received by the MDaemon account and a copy of the message that was received by the gmail account?  If you'd rather not post the messages or the screen shot, please put them in a zip file and upload them to us at https://mdaemon.sharefile.com/r-rc3922c1eed334d4dbf5e34f0bd04ccd6

    Once the file is uploaded, please let us know the name of the file.

    --
    Arron Caruth

    0 likes
  • O

    Dear Arron, 

    Thans for your reply. 

    I checked with a@notgmail.com from @yahoo.com and @icloud.com and it is not hapenning. It's only hapenning on Gmail or Google workspace based source emails with file attachement. 

    Please see the examples, I just renamed the real address as below while it might be useful for other people too: 

    Topology: x@gmail.com sends to y@mydomain.com (hosted on mdaemon) which is forwarder to z@gmail.com,no content filter is running. 

    1. x@gmail.com sending text only email to y@mydomain.com

    source:

    MIME-Version: 1.0
Date: Wed, 17 Dec 2025 19:41:22 +0100
Message-ID: <CAED5QXcHhfn7zV-3YzdBywWJp4NnKaGHE94HYP3KET-Q0YJdFA@mail.gmail.com>
Subject: Test
From: X <x@gmail.com>
To: y@mydomain.com
Content-Type: multipart/alternative; boundary="0000000000000c54a606462a32ec"

--0000000000000c54a606462a32ec
Content-Type: text/plain; charset="UTF-8"

Test Message

--0000000000000c54a606462a32ec
Content-Type: text/html; charset="UTF-8"

<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Test Message</div></div>

--0000000000000c54a606462a32ec--

    received by mdaemon: 

    X-MDAV-Result: clean
X-MDAV-Processed: mail.mydomain.com, Wed, 17 Dec 2025 19:42:04 +0100
Return-path: <x@gmail.com>
Authentication-Results: mail.mydomain.com;
	spf=pass smtp.mailfrom=_spf.google.com;
	dkim=pass (good signature) header.d=gmail.com header.b=ioahGoMqJE;
	dmarc=pass header.from=gmail.com (p=none sampling=94 pct=100);
	iprev=pass policy.iprev=2607:f8b0:4864:20::b129 (PTR mail-yx1-xb129.google.com);
	iprev=temperror reason="error during lookup" policy.iprev=2607:f8b0:4864:20::b129 (HELO mail-yx1-xb129.google.com);
	iprev=fail reason="does not match" policy.iprev=2607:f8b0:4864:20::b129 (MAIL x@gmail.Com)
Received-SPF: pass (mail.mydomain.com: domain gmail.com
	designates 2607:f8b0:4864:20::b129 as permitted sender)
	receiver=mail.mydomain.com; client-ip=2607:f8b0:4864:20::b129;
	mechanism=ip6:2607:f8b0:4000::/36; envelope-from="x@gmail.com";
	helo=mail-yx1-xb129.google.com;
Received: from mail-yx1-xb129.google.com (mail-yx1-xb129.google.com [2607:f8b0:4864:20::b129]) 
	by mail.mydomain.com (x.y.z.w) with ESMTPS id md5001000022104.msg; 
	Wed, 17 Dec 2025 19:42:02 +0100
X-Spam-Level: 
X-Spam-Status: No, score=0.30 required=5.0
X-Spam-Report:
	* -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no
	*      trust
	*      [2607:f8b0:4864:20:0:0:0:b129 listed in]
	[list.dnswl.org]
	*  0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record
	*  0.3 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in
	*      digit
	*      [x(at)gmail.com]
	*  0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider
	*      [x(at)gmail.com]
	*  0.0 HTML_MESSAGE BODY: HTML included in message
	*  0.0 TVD_SPACE_RATIO No description available.
X-Spam-Processed: mail.mydomain.com, Wed, 17 Dec 2025 19:42:02 +0100
	(processed during SMTP session)
X-MDOP-RefID: str=0001.0A2D0313.6942F977.0049,ss=1,re=0.000,recu=0.000,cl=1,cld=1,fgs=0 (_st=1 _vt=0 _iwf=0)
X-MDDKIM-Result: unapproved (mail.mydomain.com)
X-MDSPF-Result: unapproved (mail.mydomain.com)
X-MDRemoteIP: 2607:f8b0:4864:20::b129
X-MDHelo: mail-yx1-xb129.google.com
X-MDArrival-Date: Wed, 17 Dec 2025 19:42:02 +0100
X-Rcpt-To: y@mydomain.com
X-MDRcpt-To: y@mydomain.com
X-Return-Path: x@gmail.com
X-Envelope-From: x@gmail.com
X-MDaemon-Deliver-To: y@mydomain.com
Received: by mail-yx1-xb129.google.com with SMTP id 956f58d0204a3-63fc6d9fde5so5510041d50.3
        for <y@mydomain.com>; Wed, 17 Dec 2025 10:41:59 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20230601; t=1765996918; x=1766601718; darn=mydomain.com;
        h=to:subject:message-id:date:from:mime-version:from:to:cc:subject
         :date:message-id:reply-to;
        bh=BeVQQtu7K1EjeY5S/ZqSJzGYhexDs0+rdaFO5Olyth8=;
        b=ioahGoMqJE/LDpefVY11UQJpfxww9BkW500zAHp1zD+z1NuqqnDxpctzWICCg2rUQZ
         /oB87yKMCjgJFAaqC7dnp1nimDYV7WitjJD1qJ04lfAGtlpIF5xyvTr1MJdMMyQROY3s
         NnRWDKZEacu1CEy+UIgmOhX0S42Cnugs8GgvbBjjv4eWon6E7vj+yaYqO5kV80JRRhsi
         C7EYwY+iQtY1ePIRY0o/CruXnoAv0uB2uoDdFix/PxwP2xqTtMdne/W37k/sGInptsGI
         4KFjtLbVBXelKgDSkL1/Z2kspZi8w2IqoDDInLY4ZMdYFaV9ZEFJ/3xnnG+JAO3yem0L
         2ubg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20230601; t=1765996918; x=1766601718;
        h=to:subject:message-id:date:from:mime-version:x-gm-gg
         :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to;
        bh=BeVQQtu7K1EjeY5S/ZqSJzGYhexDs0+rdaFO5Olyth8=;
        b=qrcXhDVxeIRyNrX4U3d7pUnfxBQKa2MBlyy5Jk0Z1zohBkqrrMJEHdvqVLmu3bPfTo
         DAr3DgnaXpPFpxTiPQenrJvI+jVSQfvmN1pmJG0ufgMenYsVOHxlMufl+k1Zdl9p9qws
         +1Id+Q9B4aQPRryECJICfE9Ri0j4Y6Y6vwcjC7Tkh7+3tKc9QaTcyn2tdheOhTaqrIF6
         ZlM5oZIm8omT8z0YONiStylkxsmh7B5pq+vpX0CkSlGAKysKsRR9TMAlINZg8opNrMlI
         n6Icm3Q5QQOF/crKviystJirWCW08/teRm0pai6mEq21WaAsEPcOoyt7vELVzzV6PsoG
         aJ/Q==
X-Gm-Message-State: AOJu0Yyt0/4LBe1xygU4hAqP7459gf3tBaPOkGUEQDoxTFpri1Gm2Wn4
	j86PwZ7tCZsnOavW+wonj1eUOuJFfmB1/DJDDreh1gME9t23g4h7iDP3F11zdOMRH9JOVKLJmZQ
	zULmqpdYOmU06DJLjtswkwetqK+oZEGAKMg==
X-Gm-Gg: AY/fxX5gqmsRUYG/v9t+gC//DIw4+McNxZ5t6FG25ZBMqHRSq1jPIDfgrnLfJByJp2M
	dw/xGBPNF9SlnxnDbDQoalwyQzKvfTrhgqgfKOXQpruF+oEmFYx0YmCH8wLJqyYIG70CcKzPN87
	dhZHbie8xrJn7nM+yR3C2OyOBRAaS7tOkyOQez8+aEirulXT4o3vnIyZVVaXA8GZ3KV1OyUi/fO
	3V1eiJL+J4FmoPwypvsr7bMyez+ZJGYjVTJZ6ncV/ZGp5XdzMav9jGZb42SjGa2q1HPfzpglHxg
	CjKtwz7+Gw7lrt/ZrZoYJhqB5s4VBFAkmyLRpHR60Yq/qmoYD8HO8gzNKlFmIrEcYXPWPg==
X-Google-Smtp-Source: AGHT+IH739JLTWmt3zH8Nvnl1CkiqHvYUDZblelvrFdecK2K62bzu018sJkZ+C9VtQ0nUUL/TwMCpCf1EiSL0az+leQ=
X-Received: by 2002:a53:c390:0:b0:63f:2b0c:x with SMTP id
 956f58d0204a3-6455564f158mr14329767d50.60.1765996918019; Wed, 17 Dec 2025
 10:41:58 -0800 (PST)
MIME-Version: 1.0
From: X <x@gmail.com>
Date: Wed, 17 Dec 2025 19:41:22 +0100
X-Gm-Features: AQt7F2oGNo_Jz5H0GnlGUxLjaNf2CiRw5lQHnMgdq-bARfYg0drhSPZSqS4JzsM
Message-ID: <CAED5QXcHhfn7zV-3YzdBywWJp4NnKaGHE94HYP3KET-Q0YJdFA@mail.gmail.com>
Subject: Test
To: y@mydomain.com
Content-Type: multipart/alternative; boundary="000000000000f918c506462a3290"

--000000000000f918c506462a3290
Content-Type: text/plain; charset="UTF-8"

Test Message

--000000000000f918c506462a3290
Content-Type: text/html; charset="UTF-8"

<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Test Message</div></div>

--000000000000f918c506462a3290--

    The one received by z@gmail.com :

    Delivered-To: z@gmail.com
Received: by 2002:a5d:5263:0:b0:42f:b862:aa33 with SMTP id l3csp239797wrc;
        Wed, 17 Dec 2025 10:42:06 -0800 (PST)
X-Forwarded-Encrypted: i=3; AJvYcCVoiPlJccYQpFeqcpDMNZJDeSUoEmSwVgpQkX2TifcXpkl/OH1XNtdxfvhmmdM84WtfZO6ajuDcGXQqRAbcpBXs@gmail.com
X-Google-Smtp-Source: AGHT+IGQavwUPx05FjTthQUJXNwnpdSyvTNqtWOKwTLUMMeMSxqgQQ9D3fr43V2KM6AUWcgIOJG1
X-Received: by 2002:a05:6000:310f:b0:430:f704:4da with SMTP id ffacd0b85a97d-430f7040746mr15242878f8f.58.1765996926551;
        Wed, 17 Dec 2025 10:42:06 -0800 (PST)
ARC-Seal: i=2; a=rsa-sha256; t=1765996926; cv=pass;
        d=google.com; s=arc-20240605;
        b=BQLMTy7tG7aVBnbXWLX+OKK5D0zJ8TjWFQezSaH1mLU3bMZdzx3Tmz0n6k5XJ49Osd
         LjHnL6X+Fkv56cxNhgK+2P2Os889chZ4DoJBzeacNKwzRNgS865Q3BH2I6Tdk4omk9Ma
         VpWeiObAuQ4iSDgINkoFg61CQY+XCNaNswSLMg3tlEBU50tuqi43SGQC0VSeT6fQadba
         oklsczQoAemCUqmIRFNEkND7BpAQX2zdinFFrZuukudHJ6QriIcY31AxwbnXjgIU+a7I
         er+JKq5wSad9uZsjJ+3E8R/3fOTgXZJMmKdo7VNJfkxUmN4HzjukC3Sgm+C1sJN0lzVK
         jgaA==
ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20240605;
        h=to:subject:message-id:date:from:mime-version:dkim-signature;
        bh=BeVQQtu7K1EjeY5S/ZqSJzGYhexDs0+rdaFO5Olyth8=;
        fh=TLfxVsv9HDzXDOxndnJYNlILRte+azATwspzdcKWDJs=;
        b=C2ouxcSJ2Sn9v9wbrX3iJE1wVg0dlSoxmqUG0+tSYXqbyIv4S4gX5cyGCQd+1BR61+
         /1wTgOhMa3rJ0Bs8ljFluM14PMrcu7kGiGZy0d+fyqxYTuu7BvY26cqekdZmh4xujsZg
         EkWba42WyKQBrizTkEP0+nsO6p2ORrRwtG4xqCla950U6MRvTvkMWE8uw641eN4VRa8W
         jr4w53MmdGXDOkFS0wCeZuaC9kCTTvgyRMUCLhHQTnHUQTdZen4wmvS7j7r7QME7YeEO
         g+SO368970BF7ZiXU5lv3jdE21q9LqJfOvpFey99Jwx46pP9vmb++pU0KMQjJtsOx/Nl
         LANw==;
        dara=google.com
ARC-Authentication-Results: i=2; mx.google.com;
       dkim=pass header.i=@gmail.com header.s=20230601 header.b=ioahGoMq;
       arc=pass (i=1 spf=pass spfdomain=_spf.google.com dkim=pass dkdomain=gmail.com dmarc=pass fromdomain=gmail.com);
       spf=pass (google.com: domain of y@mydomain.com designates 2001:41d0:xxxxx as permitted sender) smtp.mailfrom=y@mydomain.com;
       dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com
Return-Path: <y@mydomain.com>
Received: from mail.mydomain.com (mail.mydomain.com. [2001:41d0:xxxxx])
        by mx.google.com with ESMTPS id ffacd0b85a97d-43244998e50si315542f8f.242.2025.12.17.10.42.06
        for <z@gmail.com>
        (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);
        Wed, 17 Dec 2025 10:42:06 -0800 (PST)
Received-SPF: pass (google.com: domain of y@mydomain.com designates 2001:41d0:xxxxx as permitted sender) client-ip=2001:41d0:xxxxx;
Authentication-Results: mx.google.com;
       dkim=pass header.i=@gmail.com header.s=20230601 header.b=ioahGoMq;
       arc=pass (i=1 spf=pass spfdomain=_spf.google.com dkim=pass dkdomain=gmail.com dmarc=pass fromdomain=gmail.com);
       spf=pass (google.com: domain of y@mydomain.com designates 2001:41d0:xxxxx as permitted sender) smtp.mailfrom=y@mydomain.com;
       dmarc=pass (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com
ARC-Seal: i=1; a=rsa-sha256; d=mydomain.com; s=dkim; t=1765996926; cv=none; b=LulveJownZNsLvQ/uEpGv4tX13CtS12xD3oh/Z4 552LMTBnqLojEVYn5g8KOK2tKxR+pyAPHD4mAw1MXimgpMLxjH4nSIfkEvtiGRCD bbDYrmdv7EpCO5GfZT6nb2aYBnXhrVtJI35W25zDmeS3WvCBJ6p8qUt1FZiR9RPn J2o/8p+A+fwFQtqhsl7QD+4YQrIhw9V66A8+sVV1h+ZOTMsTFK0P6sTKhUZ+wX9g 7m3Hl4SvGaZGNfVJO0m7hVfM1FE1qq27GvzbFSMkf3CWwJgpEiGnnS23UNYslRnY VI9i9qhLTvFETHPC7FBZ3kEcxtchpiojLWRbDVMlBOygg1w==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=mydomain.com; s=dkim; t=1765996926; q=dns/txt; h=Received-SPF: DKIM-Signature:MIME-Version:From:Date:Message-ID:Subject:To: Content-Type; bh=BeVQQtu7K1EjeY5S/ZqSJzGYhexDs0+rdaFO5Olyth8=; b=B7Z/Vr+FFrQQsADDlMgFPo6pJZqeRSAVBB7iSeiolc7z0VuoDy8gpE0O0AL6uf v8aPghAKH07DthOpHBDuEkOrAlBIoORrCVxxyoDdoOX+55WSG5ir1LixV6MXhPZD HRaSIDtPTZGffd70grdp3LnuPtmUdNrC0CbqjpVnbcT7LxDkHSO23cPO09lh7hwy cY3gCkNukl8kT/XA4/T7WfRSqywcduSVZZeVnZN2LrI6YFpQ8gb5G3zwfTGMlJvE rAfPjvLpCx6wqQWNM0pT14CbqJjEDJltXoIAHyVWtKy4ZbagSiXZOQZxIg+6Eslk UYZ5k3vI4RXDj0/rkEl8coyw==
ARC-Authentication-Results: i=1; mail.mydomain.com; spf=pass smtp.mailfrom=_spf.google.com; dkim=pass (good signature) header.d=gmail.com header.b=ioahGoMqJE; dmarc=pass header.from=gmail.com (p=none sampling=94 pct=100); iprev=pass policy.iprev=2607:f8b0:4864:20::b129 (PTR mail-yx1-xb129.google.com); iprev=temperror reason="error during lookup" policy.iprev=2607:f8b0:4864:20::b129 (HELO mail-yx1-xb129.google.com); iprev=fail reason="does not match" policy.iprev=2607:f8b0:4864:20::b129 (MAIL x@gmail.com)
X-MDAV-Result: clean
X-MDAV-Processed: mail.mydomain.com, Wed, 17 Dec 2025 19:42:06 +0100
X-MDAV-Result: clean
X-MDAV-Processed: mail.mydomain.com, Wed, 17 Dec 2025 19:42:04 +0100
Authentication-Results: mail.mydomain.com; spf=pass smtp.mailfrom=_spf.google.com; dkim=pass (good signature) header.d=gmail.com header.b=ioahGoMqJE; dmarc=pass header.from=gmail.com (p=none sampling=94 pct=100); iprev=pass policy.iprev=2607:f8b0:4864:20::b129 (PTR mail-yx1-xb129.google.com); iprev=temperror reason="error during lookup" policy.iprev=2607:f8b0:4864:20::b129 (HELO mail-yx1-xb129.google.com); iprev=fail reason="does not match" policy.iprev=2607:f8b0:4864:20::b129 (MAIL x@gmail.com)
Received-SPF: pass (mail.mydomain.com: domain gmail.com designates 2607:f8b0:4864:20::b129 as permitted sender) receiver=mail.mydomain.com; client-ip=2607:f8b0:4864:20::b129; mechanism=ip6:2607:f8b0:4000::/36; envelope-from="x@gmail.com"; helo=mail-yx1-xb129.google.com;
Received: from mail-yx1-xb129.google.com (mail-yx1-xb129.google.com [2607:f8b0:4864:20::b129]) by mail.mydomain.com (x.y.z.w) with ESMTPS id md5001000022104.msg; Wed, 17 Dec 2025 19:42:02 +0100
X-Spam-Level: 
X-Spam-Status: No, score=0.30 required=5.0
X-Spam-Report: * -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no *
      trust *
      [2607:f8b0:4864:20:0:0:0:b129 listed in] [list.dnswl.org] *
  0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record *
  0.3 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in *
      digit *
      [x(at)gmail.com] *
  0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider *
      [x(at)gmail.com] *
  0.0 HTML_MESSAGE BODY: HTML included in message *
  0.0 TVD_SPACE_RATIO No description available.
X-Spam-Processed: mail.mydomain.com, Wed, 17 Dec 2025 19:42:02 +0100 (processed during SMTP session)
X-MDOP-RefID: str=0001.0A2D0313.6942F977.0049,ss=1,re=0.000,recu=0.000,cl=1,cld=1,fgs=0 (_st=1 _vt=0 _iwf=0)
X-MDDKIM-Result: unapproved (mail.mydomain.com)
X-MDSPF-Result: unapproved (mail.mydomain.com)
X-MDRemoteIP: 2607:f8b0:4864:20::b129
X-MDHelo: mail-yx1-xb129.google.com
X-MDArrival-Date: Wed, 17 Dec 2025 19:42:02 +0100
X-Rcpt-To: y@mydomain.com
X-MDRcpt-To: y@mydomain.com
X-Envelope-From: x@gmail.com
Received: by mail-yx1-xb129.google.com with SMTP id 956f58d0204a3-63fc6d9fde5so5510041d50.3
        for <y@mydomain.com>; Wed, 17 Dec 2025 10:41:59 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20230601; t=1765996918; x=1766601718; darn=mydomain.com;
        h=to:subject:message-id:date:from:mime-version:from:to:cc:subject
         :date:message-id:reply-to;
        bh=BeVQQtu7K1EjeY5S/ZqSJzGYhexDs0+rdaFO5Olyth8=;
        b=ioahGoMqJE/LDpefVY11UQJpfxww9BkW500zAHp1zD+z1NuqqnDxpctzWICCg2rUQZ
         /oB87yKMCjgJFAaqC7dnp1nimDYV7WitjJD1qJ04lfAGtlpIF5xyvTr1MJdMMyQROY3s
         NnRWDKZEacu1CEy+UIgmOhX0S42Cnugs8GgvbBjjv4eWon6E7vj+yaYqO5kV80JRRhsi
         C7EYwY+iQtY1ePIRY0o/CruXnoAv0uB2uoDdFix/PxwP2xqTtMdne/W37k/sGInptsGI
         4KFjtLbVBXelKgDSkL1/Z2kspZi8w2IqoDDInLY4ZMdYFaV9ZEFJ/3xnnG+JAO3yem0L
         2ubg==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20230601; t=1765996918; x=1766601718;
        h=to:subject:message-id:date:from:mime-version:x-gm-gg
         :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to;
        bh=BeVQQtu7K1EjeY5S/ZqSJzGYhexDs0+rdaFO5Olyth8=;
        b=qrcXhDVxeIRyNrX4U3d7pUnfxBQKa2MBlyy5Jk0Z1zohBkqrrMJEHdvqVLmu3bPfTo
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         +1Id+Q9B4aQPRryECJICfE9Ri0j4Y6Y6vwcjC7Tkh7+3tKc9QaTcyn2tdheOhTaqrIF6
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         n6Icm3Q5QQOF/crKviystJirWCW08/teRm0pai6mEq21WaAsEPcOoyt7vELVzzV6PsoG
         aJ/Q==
X-Gm-Message-State: AOJu0Yyt0/4LBe1xygU4hAqP7459gf3tBaPOkGUEQDoxTFpri1Gm2Wn4 j86PwZ7tCZsnOavW+wonj1eUOuJFfmB1/DJDDreh1gME9t23g4h7iDP3F11zdOMRH9JOVKLJmZQ zULmqpdYOmU06DJLjtswkwetqK+oZEGAKMg==
X-Gm-Gg: AY/fxX5gqmsRUYG/v9t+gC//DIw4+McNxZ5t6FG25ZBMqHRSq1jPIDfgrnLfJByJp2M dw/xGBPNF9SlnxnDbDQoalwyQzKvfTrhgqgfKOXQpruF+oEmFYx0YmCH8wLJqyYIG70CcKzPN87 dhZHbie8xrJn7nM+yR3C2OyOBRAaS7tOkyOQez8+aEirulXT4o3vnIyZVVaXA8GZ3KV1OyUi/fO 3V1eiJL+J4FmoPwypvsr7bMyez+ZJGYjVTJZ6ncV/ZGp5XdzMav9jGZb42SjGa2q1HPfzpglHxg CjKtwz7+Gw7lrt/ZrZoYJhqB5s4VBFAkmyLRpHR60Yq/qmoYD8HO8gzNKlFmIrEcYXPWPg==
X-Received: by 2002:a53:c390:0:b0:63f:2b0c:2d61 with SMTP id 956f58d0204a3-6455564f158mr14329767d50.60.1765996918019; Wed, 17 Dec 2025 10:41:58 -0800 (PST)
MIME-Version: 1.0
From: X <x@gmail.com>
Date: Wed, 17 Dec 2025 19:41:22 +0100
X-Gm-Features: AQt7F2oGNo_Jz5H0GnlGUxLjaNf2CiRw5lQHnMgdq-bARfYg0drhSPZSqS4JzsM
Message-ID: <CAED5QXcHhfn7zV-3YzdBywWJp4NnKaGHE94HYP3KET-Q0YJdFA@mail.gmail.com>
Subject: Test
To: y@mydomain.com
Content-Type: multipart/alternative; boundary="000000000000f918c506462a3290"
X-MDRedirect: 1
X-MDRedirect_From: y@mydomain.com
X-Return-Path: <y@mydomain.com>
X-MDaemon-Deliver-To: <z@gmail.com>

--000000000000f918c506462a3290
Content-Type: text/plain; charset="UTF-8"

Test Message

--000000000000f918c506462a3290
Content-Type: text/html; charset="UTF-8"

<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Test Message</div></div>

--000000000000f918c506462a3290--

    As you can see everything is OK with this email, SPF, DKIM, DMARC and ARC-SEAL.

    I'm sending the failed message in the next post to keep posts organized. 

    0 likes
  • O

    In this post I continue with failed DKIM: 

    source email from x@gmail.com (with attachement)

    MIME-Version: 1.0
Date: Wed, 17 Dec 2025 19:59:41 +0100
Message-ID: <CAED5QXc7Md4Os+RbFA5kfb9hkus7K7GdNfa0xei+-byw4wK7Sw@mail.gmail.com>
Subject: Test with attachment
From: X <x@gmail.com>
To: y@mydomain.com
Content-Type: multipart/mixed; boundary="0000000000009447e606462a73e3"

--0000000000009447e606462a73e3
Content-Type: multipart/alternative; boundary="0000000000009447e606462a73e1"

--0000000000009447e606462a73e1
Content-Type: text/plain; charset="UTF-8"

Test with attachment

--0000000000009447e606462a73e1
Content-Type: text/html; charset="UTF-8"

<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Test with attachment</div></div>

--0000000000009447e606462a73e1--
--0000000000009447e606462a73e3
Content-Type: application/pdf; name="test.pdf"
Content-Disposition: attachment; filename="test.pdf"
Content-Transfer-Encoding: base64
X-Attachment-Id: f_mjadlhe60
Content-ID: <f_mjadlhe60>


--0000000000009447e606462a73e3--

    The email received by y@mydomain.com 

    X-MDAV-Result: clean
X-MDAV-Processed: mail.mydomain.com, Wed, 17 Dec 2025 20:00:33 +0100
Return-path: <x@gmail.com>
Authentication-Results: mail.mydomain.com;
	spf=pass smtp.mailfrom=_spf.google.com;
	dkim=pass (good signature) header.d=gmail.com header.b=PdePTh1Ly8;
	dmarc=pass header.from=gmail.com (p=none sampling=24 pct=100);
	iprev=pass policy.iprev=2607:f8b0:4864:20::1133 (PTR mail-yw1-x1133.google.com);
	iprev=temperror reason="error during lookup" policy.iprev=2607:f8b0:4864:20::1133 (HELO mail-yw1-x1133.google.com);
	iprev=fail reason="does not match" policy.iprev=2607:f8b0:4864:20::1133 (MAIL x@gmail.com)
Received-SPF: pass (mail.mydomain.com: domain gmail.com
	designates 2607:f8b0:4864:20::1133 as permitted sender)
	receiver=mail.mydomain.com; client-ip=2607:f8b0:4864:20::1133;
	mechanism=ip6:2607:f8b0:4000::/36; envelope-from="x@gmail.com";
	helo=mail-yw1-x1133.google.com;
Received: from mail-yw1-x1133.google.com (mail-yw1-x1133.google.com [2607:f8b0:4864:20::1133]) 
	by mail.mydomain.com (x.y.z.w) with ESMTPS id md5001000022105.msg; 
	Wed, 17 Dec 2025 20:00:32 +0100
X-Spam-Level: 
X-Spam-Status: No, score=0.30 required=5.0
X-Spam-Report:
	* -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no
	*      trust
	*      [2607:f8b0:4864:20:0:0:0:1133 listed in]
	[list.dnswl.org]
	*  0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record
	*  0.3 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in
	*      digit
	*      [x(at)gmail.com]
	*  0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider
	*      [x(at)gmail.com]
	*  0.0 HTML_MESSAGE BODY: HTML included in message
	*  0.0 T_FREEMAIL_DOC_PDF MS document or PDF attachment, from freemail
X-Spam-Processed: mail.mydomain.com, Wed, 17 Dec 2025 20:00:32 +0100
	(processed during SMTP session)
X-MDOP-RefID: str=0001.0A2D0342.6942FDCB.0047,ss=1,re=0.000,recu=0.000,cl=1,cld=1,fgs=0 (_st=1 _vt=0 _iwf=0)
X-MDDKIM-Result: unapproved (mail.mydomain.com)
X-MDSPF-Result: unapproved (mail.mydomain.com)
X-MDRemoteIP: 2607:f8b0:4864:20::1133
X-MDHelo: mail-yw1-x1133.google.com
X-MDArrival-Date: Wed, 17 Dec 2025 20:00:32 +0100
X-Rcpt-To: y@mydomain.com
X-MDRcpt-To: y@mydomain.com
X-Return-Path: x@gmail.com
X-Envelope-From: x@gmail.com
X-MDaemon-Deliver-To: y@mydomain.com
Received: by mail-yw1-x1133.google.com with SMTP id 00721157ae682-78d6a3c3b77so10200497b3.0
        for <y@mydomain.com>; Wed, 17 Dec 2025 11:00:20 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20230601; t=1765998019; x=1766602819; darn=mydomain.com;
        h=to:subject:message-id:date:from:mime-version:from:to:cc:subject
         :date:message-id:reply-to;
        bh=0j0cWmQpVlTfqgu4CfPeqMEkM3wlJyMIshjKfMiJLDo=;
        b=PdePTh1Ly8mgfM4s6xwOvQkTJuIUOjcEMmWyB+uqmtAwSOMPsSuLuOsaHeDZCAW19b
         /CI3V6ykGmdqJkNfu1xeOCJgob8RH23M0Kf9eE9XmUX+4BQbyNQjW4F/ZJ8mOpDlJo6u
         EkncyAMqXb6dSXmwD3xK3qfsEsyF/XCsPyFGPXxS4IkvxlB8ceTUoz8yck99N+L0wcE4
         ydxyBCD98J4sNJS0P0vD31qRtT+Ij3ScJ9NocK4w9+RY0yPGVDaHBPFHDJTP8hmHscHU
         /JcI3NabRSvGCYMEYVVOZsTGJLmhSuY0SQ0UbnknsKc2p3RGKuy8EEv3n09floETFZgG
         RXuw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20230601; t=1765998019; x=1766602819;
        h=to:subject:message-id:date:from:mime-version:x-gm-gg
         :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to;
        bh=0j0cWmQpVlTfqgu4CfPeqMEkM3wlJyMIshjKfMiJLDo=;
        b=sgJWxvvDqGiEaqPCM+g0Q8YJMT7Awrb4N2s+QKOSZbiNiykSKkW2g3dH+kebf4ClnN
         mfo1/WOjtA5yNsTmJQJTgQd9K50G240Oe5GGugvNUENzZincjbewk/wMAYh+ZrRACilh
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         cTvX5qoTAEA8nNCQO6calaDUXtzjxu8tJXBgL6hmhMH1750qBYPNKyPZ5YPyaF1f6i4e
         ht7w==
X-Gm-Message-State: AOJu0Yx95jbruOYfDTGhncjct0hBvMIwc53talCRAaxhQUQ76GLtfaBh
	C/ehhSAFtHvsoaF/dXKj94gy63u1O5BST5zpkCZ866Fy/hj4gWdCppS8Ylxa63gD0GhDQFc9hjU
	F+UvjJ9tNiFBikKeqriwzfxX2JJUOBzarfVVa
X-Gm-Gg: AY/fxX5MHov2fuitT6doase/L1UJB7RHmnmGLQ38kptKbGOdX0Y3XkSTcBpo0ogzGWK
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	J+2rGCfF+5PFq8C4+tvfp3w94iNGV/vJxTXecH1sbvQbZ6LsOCci5wCoxqM=
X-Google-Smtp-Source: AGHT+IEcmxyr7nT6EK9wjM2o/F2/63qDJxBFdsBqJlnLlWmqqKn3aNa/D9/13TWClCnRt4Houy/5fVVnjfpxOpsM67s=
X-Received: by 2002:a05:690e:11c6:b0:641:f5bc:692a with SMTP id
 956f58d0204a3-646632c32fbmr390792d50.35.1765998018519; Wed, 17 Dec 2025
 11:00:18 -0800 (PST)
MIME-Version: 1.0
From: X <x@gmail.com>
Date: Wed, 17 Dec 2025 19:59:41 +0100
X-Gm-Features: AQt7F2qVg3-EvoCX-oqDiuDnE_9KizDPMd78XqpUtSt9VxVPVCuZJHvqw111QIs
Message-ID: <CAED5QXc7Md4Os+RbFA5kfb9hkus7K7GdNfa0xei+-byw4wK7Sw@mail.gmail.com>
Subject: Test with attachment
To: y@mydomain.com
Content-Type: multipart/mixed; boundary="00000000000091e03706462a74e0"

--00000000000091e03706462a74e0
Content-Type: multipart/alternative; boundary="00000000000091e03606462a74de"

--00000000000091e03606462a74de
Content-Type: text/plain; charset="UTF-8"

Test with attachment

--00000000000091e03606462a74de
Content-Type: text/html; charset="UTF-8"

<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Test with attachment</div></div>

--00000000000091e03606462a74de--

--00000000000091e03706462a74e0
Content-Type: application/pdf; name="test.pdf"
Content-Disposition: attachment; filename="test.pdf"
Content-Transfer-Encoding: base64
Content-ID: <f_mjadlhe60>
X-Attachment-Id: f_mjadlhe60

JVBERi0xLjYKJfbk/N8KMSAwIG9iago8PAovQWNyb0Zvcm0gMiAwIFIKL0xhbmcgKGZyLUZSKQov
TWFya0luZm8gPDwKL01hcmtlZCB0cnVlCj4+Ci9NZXRhZGF0YSAzIDAgUgovT0NQcm9wZXJ0aWVz
IDw8Ci9EIDw8Ci9BUyBbNCAwIFIgNSAwIFIgNiAwIFJdCi9PTiBbNyAwIFJdCi9PcmRlciBbXQov
...... very loooong file content ......
--00000000000091e03706462a74e0--

    The forwarded email received by z@gmail.com

    Delivered-To: z@gmail.com
Received: by 2002:a5d:5263:0:b0:42f:b862:aa33 with SMTP id l3csp247016wrc;
        Wed, 17 Dec 2025 11:00:38 -0800 (PST)
X-Forwarded-Encrypted: i=3; AJvYcCWUjgjYjT+r/r5Yy+rWtLpqOqShBQURPEXMyv/L1eyEMkbYCfAWjG4LGR+rCLfsQpts31tvjRI/YJ+UjTVnOneN@gmail.com
X-Google-Smtp-Source: AGHT+IEk49k2gftrzxIQRbgZSlT5hR9emqGFlHh6FaLsUIV41iN/GGPoIYvuujLvXfYA80zq13IY
X-Received: by 2002:a05:6000:2001:b0:430:f7ae:af3c with SMTP id ffacd0b85a97d-430f7aeb06dmr14400258f8f.31.1765998037914;
        Wed, 17 Dec 2025 11:00:37 -0800 (PST)
ARC-Seal: i=2; a=rsa-sha256; t=1765998037; cv=pass;
        d=google.com; s=arc-20240605;
        b=MoNzx+mSQa31+wshq+e6uMGb+Gcwv5xZStHfzhjmCkEEOBbVkZFXzNiAhTYq7r1A++
         9QjsylgQhKfzy82OLZo2qyyjwniPOk1f6GPhM52lW3XOjLj71htAlpFkoCSnopH2wpiJ
         SCucHUZFK0qGe8m6k9SG/KT0gBlPEzqzRhpjvwym/Gq0C4oxMZTDqTGwDgz7bf1EWDHR
         URcqJCJ63N6Z/X4ZxP4JanL7PMJdY8hW26a6Q9W2dT3YahwvNRQ3yKCqMCKpwVmSz4Pv
         QvgPZDTTEsBBuKSYdNkFMzppO2WG5lP6GAIkjBJbovwRvjFb/Nk/julXpj9TAg9fhQ2W
         9xwA==
ARC-Message-Signature: i=2; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20240605;
        h=to:subject:message-id:date:from:mime-version:dkim-signature;
        bh=vqvpjesSIQ0S7clHl8Xw1BRJYSoDHCFban42zEwHr70=;
        fh=TLfxVsv9HDzXDOxndnJYNlILRte+azATwspzdcKWDJs=;
        b=YMTX7/27zmw/wNLhCenAiogNuBiHwNuEdsXA+2MiV8RgqCgkE/cQQP7J3qsCVyOs4j
         7HAIMQBLnNW3/Y11P9cW3U3PZLJiMMb3m+LtQv7B1ISSIc1CdT2RtByQmQZMwgTOTHM8
         0LQ+C3ybJff89RhC9DVRRoQ8F64md6aRijk9P2IC781hUs1kZ2HYXROigpX8qEVh7iwQ
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         DMPXkRpF7vPJkydAHxLrLig4S8HxRQdjK6afOw7nJuQIJFrvfAgrII99t3Bw5GzYa/yR
         CIvQ==;
        dara=google.com
ARC-Authentication-Results: i=2; mx.google.com;
       dkim=neutral (body hash did not verify) header.i=@gmail.com header.s=20230601 header.b=PdePTh1L;
       arc=pass (i=1 spf=pass spfdomain=_spf.google.com dkim=pass dkdomain=gmail.com dmarc=pass fromdomain=gmail.com);
       spf=pass (google.com: domain of y@mydomain.com designates xxxxxxxxxx as permitted sender) smtp.mailfrom=y@mydomain.com;
       dmarc=fail (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com
Return-Path: <y@mydomain.com>
Received: from mail.mydomain.com (mail.mydomain.com. [xxxxxxxxxx])
        by mx.google.com with ESMTPS id ffacd0b85a97d-4324492df5dsi395922f8f.46.2025.12.17.11.00.37
        for <z@gmail.com>
        (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256);
        Wed, 17 Dec 2025 11:00:37 -0800 (PST)
Received-SPF: pass (google.com: domain of y@mydomain.com designates xxxxxxxxxx as permitted sender) client-ip=xxxxxxxxxx;
Authentication-Results: mx.google.com;
       dkim=neutral (body hash did not verify) header.i=@gmail.com header.s=20230601 header.b=PdePTh1L;
       arc=pass (i=1 spf=pass spfdomain=_spf.google.com dkim=pass dkdomain=gmail.com dmarc=pass fromdomain=gmail.com);
       spf=pass (google.com: domain of y@mydomain.com designates xxxxxxxxxx as permitted sender) smtp.mailfrom=y@mydomain.com;
       dmarc=fail (p=NONE sp=QUARANTINE dis=NONE) header.from=gmail.com
ARC-Seal: i=1; a=rsa-sha256; d=mydomain.com; s=dkim; t=1765998037; cv=none; b=Hi3a7lYAdXgBgw3aCp23OK3l/+nWBsLEZjoiqMg aYclMtWZmx0cAzFju1WnK25pMuWUmaucMkgWS8cLxT8taZGVaMI+HA5Fb5hxK/r2 y7qqfC2yExoUea3gVz3YZxsqPZBTRT3STRNqIA6r/YTP1HzUUTTQ6gqwKA+x41bk EbXVlKFWX1h8Md366DxgbizDLfYo+Dr4Y0VOpMrRvMw4FLiXJb5XEMyn03USDtUi zwSHSHuzTeLpmActVP7OjSxF3tUbWBp0rBwgwjOkb8IHQ5V5zU71jNwJ6tk+GIwr 3pMuAvfjyfD2UyJvNAFEKHONm4h+Db3M8DDopeOJ1MF/EAw==
ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=mydomain.com; s=dkim; t=1765998037; q=dns/txt; h=Received-SPF: DKIM-Signature:MIME-Version:From:Date:Message-ID:Subject:To: Content-Type; bh=vqvpjesSIQ0S7clHl8Xw1BRJYSoDHCFban42zEwHr70=; b=muRBWUZTPokBSd0JraGNQzkXHXhEUiQVH9HF+zpg6PSi5gCCBOvbWD8YIpp+gl s9lfUMo77FuYaqnGWs8QAxulefy0+vxorvfAWrvk1iJLpg832a9dD4xTPzZR/8Q2 opet0YTGanKDis5yEYAJ3t+fze9TU8GHGCqNbJrDfCgxvOjqL7R5IN+f0hx496KZ gyWWAQZ29uvbHnJY9YyiJQ61n/vC3mUDePlMub/jmpUySpuvN5vvC5H14ia8IAv9 bhWUJCAQKoOE/3tXUF68mp+bTs4XmQYaIbFRQfOYnXzs23YRp1DOhsWa82KPi9ke b84Uqs4HPB680RNtE+Goh88g==
ARC-Authentication-Results: i=1; mail.mydomain.com; spf=pass smtp.mailfrom=_spf.google.com; dkim=pass (good signature) header.d=gmail.com header.b=PdePTh1Ly8; dmarc=pass header.from=gmail.com (p=none sampling=24 pct=100); iprev=pass policy.iprev=2607:f8b0:4864:20::1133 (PTR mail-yw1-x1133.google.com); iprev=temperror reason="error during lookup" policy.iprev=2607:f8b0:4864:20::1133 (HELO mail-yw1-x1133.google.com); iprev=fail reason="does not match" policy.iprev=2607:f8b0:4864:20::1133 (MAIL x@gmail.Com)
X-MDAV-Result: clean
X-MDAV-Processed: mail.mydomain.com, Wed, 17 Dec 2025 20:00:37 +0100
X-MDAV-Result: clean
X-MDAV-Processed: mail.mydomain.com, Wed, 17 Dec 2025 20:00:33 +0100
Authentication-Results: mail.mydomain.com; spf=pass smtp.mailfrom=_spf.google.com; dkim=pass (good signature) header.d=gmail.com header.b=PdePTh1Ly8; dmarc=pass header.from=gmail.com (p=none sampling=24 pct=100); iprev=pass policy.iprev=2607:f8b0:4864:20::1133 (PTR mail-yw1-x1133.google.com); iprev=temperror reason="error during lookup" policy.iprev=2607:f8b0:4864:20::1133 (HELO mail-yw1-x1133.google.com); iprev=fail reason="does not match" policy.iprev=2607:f8b0:4864:20::1133 (MAIL x@gmail.Com)
Received-SPF: pass (mail.mydomain.com: domain gmail.com designates 2607:f8b0:4864:20::1133 as permitted sender) receiver=mail.mydomain.com; client-ip=2607:f8b0:4864:20::1133; mechanism=ip6:2607:f8b0:4000::/36; envelope-from="x@gmail.Com"; helo=mail-yw1-x1133.google.com;
Received: from mail-yw1-x1133.google.com (mail-yw1-x1133.google.com [2607:f8b0:4864:20::1133]) by mail.mydomain.com (x.y.z.w) with ESMTPS id md5001000022105.msg; Wed, 17 Dec 2025 20:00:32 +0100
X-Spam-Level: 
X-Spam-Status: No, score=0.30 required=5.0
X-Spam-Report: * -0.0 RCVD_IN_DNSWL_NONE RBL: Sender listed at https://www.dnswl.org/, no *
      trust *
      [2607:f8b0:4864:20:0:0:0:1133 listed in] [list.dnswl.org] *
  0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record *
  0.3 FREEMAIL_ENVFROM_END_DIGIT Envelope-from freemail username ends in *
      digit *
      [x(at)gmail.com] *
  0.0 FREEMAIL_FROM Sender email is commonly abused enduser mail provider *
      [x(at)gmail.com] *
  0.0 HTML_MESSAGE BODY: HTML included in message *
  0.0 T_FREEMAIL_DOC_PDF MS document or PDF attachment, from freemail
X-Spam-Processed: mail.mydomain.com, Wed, 17 Dec 2025 20:00:32 +0100 (processed during SMTP session)
X-MDOP-RefID: str=0001.0A2D0342.6942FDCB.0047,ss=1,re=0.000,recu=0.000,cl=1,cld=1,fgs=0 (_st=1 _vt=0 _iwf=0)
X-MDDKIM-Result: unapproved (mail.mydomain.com)
X-MDSPF-Result: unapproved (mail.mydomain.com)
X-MDRemoteIP: 2607:f8b0:4864:20::1133
X-MDHelo: mail-yw1-x1133.google.com
X-MDArrival-Date: Wed, 17 Dec 2025 20:00:32 +0100
X-Rcpt-To: y@mydomain.com
X-MDRcpt-To: y@mydomain.com
X-Envelope-From: x@gmail.Com
Received: by mail-yw1-x1133.google.com with SMTP id 00721157ae682-78d6a3c3b77so10200497b3.0
        for <y@mydomain.com>; Wed, 17 Dec 2025 11:00:20 -0800 (PST)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20230601; t=1765998019; x=1766602819; darn=mydomain.com;
        h=to:subject:message-id:date:from:mime-version:from:to:cc:subject
         :date:message-id:reply-to;
        bh=0j0cWmQpVlTfqgu4CfPeqMEkM3wlJyMIshjKfMiJLDo=;
        b=PdePTh1Ly8mgfM4s6xwOvQkTJuIUOjcEMmWyB+uqmtAwSOMPsSuLuOsaHeDZCAW19b
         /CI3V6ykGmdqJkNfu1xeOCJgob8RH23M0Kf9eE9XmUX+4BQbyNQjW4F/ZJ8mOpDlJo6u
         EkncyAMqXb6dSXmwD3xK3qfsEsyF/XCsPyFGPXxS4IkvxlB8ceTUoz8yck99N+L0wcE4
         ydxyBCD98J4sNJS0P0vD31qRtT+Ij3ScJ9NocK4w9+RY0yPGVDaHBPFHDJTP8hmHscHU
         /JcI3NabRSvGCYMEYVVOZsTGJLmhSuY0SQ0UbnknsKc2p3RGKuy8EEv3n09floETFZgG
         RXuw==
X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=1e100.net; s=20230601; t=1765998019; x=1766602819;
        h=to:subject:message-id:date:from:mime-version:x-gm-gg
         :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to;
        bh=0j0cWmQpVlTfqgu4CfPeqMEkM3wlJyMIshjKfMiJLDo=;
        b=sgJWxvvDqGiEaqPCM+g0Q8YJMT7Awrb4N2s+QKOSZbiNiykSKkW2g3dH+kebf4ClnN
         mfo1/WOjtA5yNsTmJQJTgQd9K50G240Oe5GGugvNUENzZincjbewk/wMAYh+ZrRACilh
         YimtEUUgA9+WIPCBCV0zMCcDEUxe3ceDwcCckOU9Vu43jtO94gECmFx7OLnPbaCVEaSB
         OJRqww/VKIKXtstXLyW0Ni9qEV6sIDjYQ+KBhyD/NzxbQiYTwGAFOG695BVp9zKyugoK
         cTvX5qoTAEA8nNCQO6calaDUXtzjxu8tJXBgL6hmhMH1750qBYPNKyPZ5YPyaF1f6i4e
         ht7w==
X-Gm-Message-State: AOJu0Yx95jbruOYfDTGhncjct0hBvMIwc53talCRAaxhQUQ76GLtfaBh C/ehhSAFtHvsoaF/dXKj94gy63u1O5BST5zpkCZ866Fy/hj4gWdCppS8Ylxa63gD0GhDQFc9hjU F+UvjJ9tNiFBikKeqriwzfxX2JJUOBzarfVVa
X-Gm-Gg: AY/fxX5MHov2fuitT6doase/L1UJB7RHmnmGLQ38kptKbGOdX0Y3XkSTcBpo0ogzGWK 5wfCRFfjn8RDoJfu9PQcwvRGftSAbbKsdv10n/3fxupOqsq7/hY0bpTWeYDKRg/lUygVdoJsQ9h hpt6ZLFbOJp1TMunHUkyAKUZp6gxUB7d0fw5+8W182R8arfrE6fkQzCTQbuQelrMm7/QvSJbRsI 9dwwG0gT3YebS8cyh8OA0Y5rxdCaY2l9txzfbJMUlQxD9Z8YU8J2wplBf/23pRSm1D2qcGPA40/ J+2rGCfF+5PFq8C4+tvfp3w94iNGV/vJxTXecH1sbvQbZ6LsOCci5wCoxqM=
X-Received: by 2002:a05:690e:11c6:b0:641:f5bc:692a with SMTP id 956f58d0204a3-646632c32fbmr390792d50.35.1765998018519; Wed, 17 Dec 2025 11:00:18 -0800 (PST)
MIME-Version: 1.0
From: X <x@gmail.Com>
Date: Wed, 17 Dec 2025 19:59:41 +0100
X-Gm-Features: AQt7F2qVg3-EvoCX-oqDiuDnE_9KizDPMd78XqpUtSt9VxVPVCuZJHvqw111QIs
Message-ID: <CAED5QXc7Md4Os+RbFA5kfb9hkus7K7GdNfa0xei+-byw4wK7Sw@mail.gmail.com>
Subject: Test with attachment
To: y@mydomain.com
Content-Type: multipart/mixed; boundary="00000000000091e03706462a74e0"
X-MDRedirect: 1
X-MDRedirect_From: y@mydomain.com
X-Return-Path: <y@mydomain.com>
X-MDaemon-Deliver-To: <z@gmail.com>

--00000000000091e03706462a74e0
Content-Type: multipart/alternative; boundary="00000000000091e03606462a74de"

--00000000000091e03606462a74de
Content-Type: text/plain; charset="UTF-8"

Test with attachment

--00000000000091e03606462a74de
Content-Type: text/html; charset="UTF-8"

<div dir="ltr"><div class="gmail_default" style="font-family:tahoma,sans-serif">Test with attachment</div></div>

--00000000000091e03606462a74de--
--00000000000091e03706462a74e0
Content-Type: application/pdf; name="test.pdf"
Content-Disposition: attachment; filename="test.pdf"
Content-Transfer-Encoding: base64
Content-ID: <f_mjadlhe60>
X-Attachment-Id: f_mjadlhe60


--00000000000091e03706462a74e0--

    So far I can see that in Mdaemon file is received inline but in z@gmail.com it is not inline.

    I hope these be useful, Thanks in advance for your help

    0 likes
  • A

    This is caused by MDaemon adding a blank line to the message that it should not be adding.  I've submitted a bug for our development team to review.

     

    --
    Arron Caruth

  • O

    Dear Arron, Thanks for your great follow up. Fingers crossed :) 

    0 likes
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