Filtering emails from compromised companies

Question

Filtering emails from compromised companies

Steve Potts 1

Hello,

I'm wondering if there's solution to managing emails that come into our organization from compromised accounts. I work for a Charity, and we are seeing more and more email accounts sending mass emails to our users, but as the sender address is known, or legitimate, the mail server\Mimecast isn't rejecting them. is there any systems or tools with email management that could detect mass emails to internal recipients and hold\reject based on set criteria?
We currently are moving to Exchange online, and have the O365 Business Premium plan with Mimecast as our email\spam system.

Many thanks
Steve

Faery Fu-MSFT 19,751 Reputation points Moderator

2022-12-19T06:30:46.187+00:00
Hi @Steve Potts ,
In order to better understand your scenario, please provide some detailed information:

Does this compromised accounts refer to external senders?

Does the MX record point to third-party spam filtering?
Faery Fu-MSFT 19,751 Reputation points Moderator

2022-12-23T09:38:32.347+00:00

Hi @Steve Potts ,
Just check if this thread has an update, any updates are appreciated.