[exim] Hit with some kind of hidden multiple recipients rela…

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Autor: Henry S. Thompson
Datum:  
To: exim-users
Betreff: [exim] Hit with some kind of hidden multiple recipients relay hack?
I came back from a few days out of town to find 1000s of frozen queue
entries and my server blacklisted by gmail. Here's a sample:

  : mailq | head -20
   6d  1.3K 1nKNYR-000bDv-0w <test@???> *** frozen ***
          D 0002arun@???
          D 0005ace@???
          D 00076alek@???
          D 0007sd@???
          D 000top@???
          D 001adline@???
          D 001andrecarter@???
          D 001mayer@???
          D 001ndumiso@???
          D 001ontu@???
          D 001oricom@???
          D 002samudra@???
          D 002xyz@???
            003garciab1@???
          D 0069kh@???
          D 007forme@???


And here's what that item looks like in detail:

  : exim4 -Mvc 1nKNYR-000bDv-0w|head -20
  Received: from [103.104.169.173] (helo=ogcb16c7f19.openstacklocal)
          by home.hst.name with esmtp (Exim 4.94.2)
          (envelope-from <test@???>)
          id 1nKNYR-000bDv-0w; Wed, 16 Feb 2022 16:53:23 +0000
  Content-Type: text/plain; charset="utf-8"
  MIME-Version: 1.0
  Content-Transfer-Encoding: quoted-printable
  Content-Description: Mail message body
  Subject: From The Commissioner Debt Management Service 
  To: Recipients <test@???>
  From: "Mr. Timothy Gribben" <test@???>
  Date: Thu, 17 Feb 2022 00:53:15 +0800
  Reply-To: timothygribs00@???


...

I don't have open relaying set up, at least I don't think so, and a
few online checkers agree...

How is this happening/where are the recipients coming from?

More importantly, how do I fix my exim4 configuration to stop this!

Thanks for any help,

ht
--
Henry S. Thompson