On 15/09/23 17:01, Marc wrote:

Anyone have any experience with a dns blacklist specific to known smtp auth 
abuse?
Yes, at previous $dayjob. Applied on the submission MSA, it proved to be useful in mitigating the fallout when users got their credentials compromised.

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Best regards,
Riccardo Alfieri

Spamhaus Technology
https://www.spamhaus.com/

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