Issue Mail Delivery

[voelu28]

Server operating system version

Ubuntu 20.04.6 LTS

Plesk version and microupdate number

18.0.49 Update #2

Hello, I have the following problem for some time.
A customer sends emails to their customers under the email mike@domain.com, but they do not arrive.
I use DMARC, SPF, and DKIM. Furthermore, I use Plesk Email Security.
The following email comes back:

This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of
its recipients. This is a permanent error.

The following address failed:

example@example.com:
SMTP error from remote server for TEXT command, host: mxa-001d0c01.gslb.private.com (185.132.XX.XXX) reason: 550 5.7.0 Local Policy Violation


--- The header of the original message is following. ---
Received: from [IPV6:::1] ([80.187.XX.XXX]) by mailserver.com
(mreue009 [212.227.XX.XXX]) with ESMTPSA (Nemesis) id
1MStKw-1pto650zte-00ULDn for <example@example.com>; Tue, 18 Apr 2023
15:36:55 +0200
Message-ID: <eb0c9330-306e-3308-44bb-5f072be0e4aa@mydomain.com>
Date: Tue, 18 Apr 2023 15:36:53 +0200
MIME-Version: 1.0
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101
Thunderbird/102.10.0
Content-Language: en-EN
To: example@example.com
From: =Mike= <mike@mydoamain.com>
Subject: Private
Content-Type: text/plain; charset=UTF-8; format=flowed
Content-Transfer-Encoding: 8bit
X-Antivirus: Avast (VPS 230418-4, 18.4.2023), Outbound message
X-Antivirus-Status: Clean
X-Provags-ID: V03:K1:8JY0aELImPIUQEmJM27i62ST4NBot93eXr09c6kRyk1ChJ+W46N
NpU/tqERVuALz16C+VEDhef6DuNvmQ+4tlDqjFBxLp1Gog3CAu9bhlvJGISBghMsksftsDG
SOUvxtYu5LFAGUc/FARlmJt2hMkzyQP/pVN8r1nzIRK41E0S6sQ8IXxkC6RzZAYjjoZ
A+shCUU3U
X-Spam-Flag: NO
UI-OutboundReport: notjunk:1;M010:M71zlo03Vv8=;QmRR+pSTeEQPMx924Luny4cSPk6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 

[scsa20]

I am not understanding the flow, is the email in question that's on plesk being mike@pleskdomain.com sending an email to someone@someotherdomain.com? What's the bounce back message they're getting if any?

If the quoted message is from the user sending from your plesk server to the other person and you're getting a local policy violation, then the other party needs to see why it's being rejected before you can even think about looking to see if it's a configuration issue on your end.

 

[voelu28]

"Mike" getting this from different persons back. It's not always the same mailserver.
So I think it's an issue on my end. Most of this persons working for very big companys. So I think they don't allow my host.
Had the same issue with "@t-online.de". One of the biggest mailprovider in germany. They had to unlock my host...

 

[MarkM]

Have you tried testing the email using mail tester?

Newsletters spam test by mail-tester.com

mail-tester.com is a free online service that allows you to test your emails for Spam, Malformed Content and Mail Server Configuration problems

www.mail-tester.com

Should point out any recommendations as far as what to change to maximize delivery.