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

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Autore: Jeremy Harris
Data:  
To: exim-users
Oggetto: Re: [exim] Hit with some kind of hidden multiple recipients relay hack?
On 22/02/2022 18:39, Henry S. Thompson via Exim-users wrote:
> 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?


Start with your log. How was 1nKNYR-000bDv-0w submitted?

From the headers:
Is "home.hst.name" your system? (PS: Obfuscation makes it
harder to help). Is [103.104.169.173] on your net?

--
Cheers,
Jeremy