Email not delivering to hotmail, and extra headers [closed] - linux

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I'm setting up an e-mail server and had a hard time trying to modify the headers, and getting it to e-mail hotmail.
Here are the complete headers from mail-tester.com:
Received: by mail-tester.com (Postfix, from userid 500)
id EBF72A56C8; Tue, 20 Mar 2018 22:12:50 +0100 (CET)
Authentication-Results: mail-tester.com;
dkim=pass (1024-bit key; unprotected) header.d=example.com header.i=#example.com header.b=CktBFAHr;
dkim-atps=neutral
X-Spam-Checker-Version: SpamAssassin 3.4.1 (2015-04-28) on mail-tester.com
X-Spam-Level:
X-Spam-Status: No/-0.1/5.0
X-Spam-Test-Scores: DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,
SPF_PASS=-0.001,T_RP_MATCHES_RCVD=-0.01
X-Spam-Last-External-IP: XXX.XX.X.XXX
X-Spam-Last-External-HELO: mail.example.com
X-Spam-Last-External-rDNS: mail.example.com
X-Spam-Date-of-Scan: Tue, 20 Mar 2018 22:12:50 +0100
X-Spam-Report:
* -0.0 T_RP_MATCHES_RCVD Envelope sender domain matches handover relay
* domain
* -0.0 SPF_PASS SPF: sender matches SPF record
* -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's
* domain
* -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature
* 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily
* valid
Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=XXX.XX.X.XXX; helo=mail.example.com; envelope-from=diana#example.com; receiver=someid#mail-tester.com
DMARC-Filter: OpenDMARC Filter v1.3.1 mail-tester.com 8D270A56BF
Authentication-Results: mail-tester.com; dmarc=pass header.from=example.com
Authentication-Results: mail-tester.com;
dkim=pass (1024-bit key; unprotected) header.d=example.com header.i=#example.com header.b=CktBFAHr;
dkim-atps=neutral
Received: from mail.example.com (mail.example.com [XXX.XX.X.XXX])
(using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits))
(No client certificate requested)
by mail-tester.com (Postfix) with ESMTPS id 8D270A56BF
for <someid#mail-tester.com>; Tue, 20 Mar 2018 22:12:49 +0100 (CET)
Authentication-Results: mail.example.com (amavisd-new);
dkim=pass (1024-bit key) reason="pass (just generated, assumed good)"
header.d=example.com
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=
example.com; h=date:date:message-id:from:from:subject
:subject:to:mime-version:content-type:content-type; s=dkim; t=
1521580077; x=1522444078; bh=TlT4DDWYdTBodPmtN0k/UUjJKsfuwGfVa+p
3RfS7B2o=; b=CktBFAHrWBH8zJY5d/A5VxiAYybD2hX5O+u6tJ6I7itc+QAeFyo
9a1cQjFvhw6PyftRVM/eAwAd6ns4pejY5fubMSFl29SUosqV1nXVmxr8xzV0RBTP
/L0o6gpSWAgYGzV++qw5QIRlwA0VCqNGD/wrUoZybijvp9QHgwYx6FPg=
X-Virus-Scanned: Debian amavisd-new at
Content-Type: multipart/mixed; boundary="===============7137656464834900843=="
MIME-Version: 1.0
To: someid#mail-tester.com
Subject: The e-mail subject
From: Princess Diana <diana#example.com>
Message-Id: <20180320210757.24D3E50C0FC9#mail.example.com>
Date: Tue, 20 Mar 2018 17:07:57 -0400 (EDT)
--===============7137656464834900843==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Just a small test....
--===============7137656464834900843==--
Now, everything is setup and OK, the DKIM, SPF, and DMARC.
I'm trying to remove X-Spam-Last-External-IP: XXX.XX.X.XXX header that forwards client IP, and to somehow modify Received-SPF: Pass (sender SPF authorized) identity=mailfrom; client-ip=XXX.XX.X.XXX; helo=mail.example.com; envelope-from=diana#example.com; receiver=someid#mail-tester.com which also forwards client IP to every e-mail sent.
I've had no success in removing the first header or modifying the second one.
Also, the e-mail never get into an Hotmail mailbox, not even from RoundCube, and mail.log file shows a successful queued for delivery message. What am I doing wrong?

Answer 1

When connecting over SMTP most servers will add a Received: header with the relevant details. This is an important part of the email reputation ecosystem since it means sending IPs must be accountable for their sending activity.
If you make use of an email relay that may shift the address shown one step down the chain, or you can choose to use an API-driven email service where there's no direct SMTP connection between your application and the mail service. In those cases the IP shown is almost always the mail service you're using and not your own system, giving you a layer of separation and security.