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a friend of mine is running a contact form on a website which sends the e-mails through the PHP mail() function (CMS used is Contao). The e-mails are sent without a problem to other recipients, so neither the CMS itself or the server responsible for sending are the problem. However, the two e-mails that these messages are actually supposed to be sent to, are run through Exchange Online (Office 365). It seems like there is some kind of protection going on that blocks these e-mails. Every other e-mail from actual mail clients goes through. I couldn't find any setting in the Exchange AC regarding to this.

Here are the email headers from the contact form messages (sent a message from the contact form to another e-mail, where, again, it is received just fine):

Return-Path: <info@rechtsanwaelte-brauer.de>
Delivered-To: hello@max-krause.com
Received: from premium31.web-hosting.com
    by premium31.web-hosting.com with LMTP id UBwiOpOw0VsKMAwAmYe65g
    for <hello@max-krause.com>; Thu, 25 Oct 2018 08:01:23 -0400
Return-path: <info@rechtsanwaelte-brauer.de>
Envelope-to: hello@max-krause.com
Delivery-date: Thu, 25 Oct 2018 08:01:23 -0400
Received: from u230.lrnc.net ([77.232.241.23]:47206)
    by premium31.web-hosting.com with esmtp (Exim 4.91)
    (envelope-from <info@rechtsanwaelte-brauer.de>)
    id 1gFeKJ-003PuQ-PW
    for hello@max-krause.com; Thu, 25 Oct 2018 08:01:23 -0400
Received: by u230.lrnc.net (Postfix, from userid 10020)
    id 15D73C46B8; Thu, 25 Oct 2018 14:01:03 +0200 (CEST)
To: nicole.darmstadt@gmail.com, info@rechtsanwaelte-brauer.de, nicole.brauer@rechtsanwaelte-brauer.de, webmaster@up-hill.de, cj@junglas.com, hello@max-krause.com
Subject: Nachricht =?utf-8?Q?=C3=BCber?= die Webseite
Message-ID: <df7341d6b1d12752e351cd238854774a@www.brauer-rechtsanwaeltin.de>
Date: Thu, 25 Oct 2018 12:01:02 +0000
From: info@rechtsanwaelte-brauer.de
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8
Content-Transfer-Encoding: quoted-printable
X-Priority: 3 (Normal)
X-Mailer: Contao Open Source CMS

Could anyone point me to where the problem might be?

Maximilian Krause
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1 Answers1

3

I verified if your email would be permitted by the SPF records on the domain. I used the Python spf module to do so. Here is the result:

>>> import spf
>>> spf.query('77.232.241.23', 'info@rechtsanwaelte-brauer.de', 'u230.lrnc.net').check()
('fail', 550, 'SPF fail - not authorized')
>>>

As you can see using the information from your email header, the email would have been rejected by a sender verifying SPF. 77.232.241.23 is not permitted to send emails from the domain rechtsanwaelte-brauer.de.

Changing your SPF record from

v=spf1 include:spf.protection.outlook.com -all

to

v=spf1 ip4:77.232.241.23 include:spf.protection.outlook.com -all

should help. Remember to find out what your IPv6 address is and include that as well.

kasperd
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