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Question Block mail if domain doesn't exist in Plesk

C

checkinindza

New Pleskian
Server operating system version
Ubuntu 22.04.5
Plesk version and microupdate number
18.0.64 Update #1
Hi,

So we had a situation where one of our clients used your mail server info on their other website that wasn't hosted on our server and that domain doesn't even exist in our server. I'm gonna guess that they either were injected with some script or someone just hacked them and started spamming a lot of emails from their domain with our IP. The result - the sender score dropped and now other clients are suffering because of it. Made a mistake of not noticing this sooner, then the result wouldn't be so bad, but it is what it is.

I'm wondering if there's a way to avoid this in the future - to not allow domain to send mail if it doesn't even exist in our server.

Thank you in advance.
 
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