I've just received this mail delivery failure:
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(es) failed:
nc-strahlca@netcologne.de
(generated from carsten.strahl@koeln.de)
host cc-mx3.netcologne.de [2001:4dd0:100:1062:25:3:0:3]
SMTP error from remote mail server after end of data:
550 Sorry your message looks like a spam and we don't want it. If you believe this is wrong, contact spfb@netcologne.de and mention id=153929::1616948557-0000784D-0F2C2CC3/10/38376054500
______________________________________________
This email has been scanned by Netintelligence
http://www.netintelligence.com/email
Reporting-MTA: dns; manhattan.snafu.de
Action: failed
Final-Recipient: rfc822;carsten.strahl@koeln.de
Status: 5.0.0
Remote-MTA: dns; cc-mx3.netcologne.de
Diagnostic-Code: smtp; 550 Sorry your message looks like a spam and we don't want it. If you believe this is wrong, contact spfb@netcologne.de and mention id=153929::1616948557-0000784D-0F2C2CC3/10/38376054500
Return-path: <v>
Received: from net-93-147-239-161.cust.vodafonedsl.it ([93.147.239.161])
by manhattan.snafu.de with esmtp (Exim 4.94)
id 1lQYBQ-00008x-As
for carsten.strahl@koeln.de; Sun, 28 Mar 2021 18:22:36 +0200
Date: 28 Mar 2021 18:55:36 +0100
From: "carsten.strahl@koeln.de" <USER@MYDOMAIN>
X-Priority: 3
Message-ID: <098207061.202103281922@MYDOMAIN>
To: <carsten.strahl@koeln.de>
Subject: Re:Bitcoin Investment
MIME-Version: 1.0
Content-Type: text/plain; charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
X-SA-Exim-Connect-IP: 93.147.239.161
X-SA-Exim-Mail-From: USER@MYDOMAIN
X-SA-Exim-Scanned: No (on manhattan.snafu.de); SAEximRunCond expanded to false
USER is a valid alias, I can't remember what it was set up for. Some one-time shopping thing probably, I'll be able to look it up when I'm home.
MYDOMAIN is my .co.uk domain
I'm pretty confident I don't have interlopers in or relaying through my mail server, it's been shut down for 4 weeks. More likely someone has guessed/rainbowed/bruteforced my ISP passwords. There could be a nasty in our network but remote use is more likely.
I've suspected something like this might be going on for a while, lots of domains, e.g. road.cc refuse to send emails to me as if I'm on a naughty list. Is there anything I can do other than phase out using the domain and start another?