You might want to take this off list.. (SpamRats questions)
SpamRats has nothing to do with Microsoft, but it does have two lists
that can help with Spammers on Azure.
RATS-AZURE simply lists all IPs on Azure, for convenience in BMS or RBL
format.
RATS-SPAM will list spam sources detected on Azure IP Space as well as
other sources..
....
But, as to the thread on MAIL FROM: <>, as pointed out that would block
any 'bounce' messages originating from Azure, and probably not what you
want. The case of one of the CloudApp spammers is they do a 'fake
bounce', and you have to check other markers as well to ensure you don't
block legitimate notices.
(Anyone sending with an empty MAIL FROM that isn't a bounce deserves to
be collatoral damage IMHO ;)
In the case below, you will see that there are no trace headers, except
the one inserted by the receiving MTA.. There is no Message-Id header.
You can use a combination of checks like that to ensure that you don't
reject real bounce messages.
You might find that a 'fake bounce' filtering rule will help deal with a
lot of these, no matter what the source, but from large cloud providers,
it can be a real savior..
We like to do it right in the SMTP layer, but if your MTA can't do that,
then a simple SpamAssassin rule or rspamd rule should work..
Received: from dns69386134.westus3.cloudapp.azure.com (HELO
k8zs.thecheckingaccountzippers.com)
To: REDACCTED
From: =?UTF-8?B?Q29uZ3JhdHVsYXRpb25zIQ==?= <[email protected]>
Content-Transfer-Encoding: 7bit
Subject:
=?UTF-8?B?WW91IGhhdmUgYmVlbiBjaG9zZW4gdG8gcGFydGljaXBhdGUgaW4gb3VyIExveWFsdHkgUHJvZ3JhbSBmb3IgRlJFRSEg?=
Content-Type: text/html; charset=UTF-8
On 2021-11-02 6:05 a.m., Slavko via mailop wrote:
Dňa 1. novembra 2021 23:09:56 UTC používateľ Michael Peddemors via mailop
<[email protected]> napísal:
The 'current' link.. (it does change) is..
https://www.microsoft.com/en-us/download/confirmation.aspx?id=41653
Please, what have Microsoft with SpamRats?
Slavko
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