Block E-Mails from coming to the EOP quarantine?

Question

Hi,

we are using MS EOP and quarantine is doing it's job ok but I would want to really block some senders so that we DON'T even see the e-mails in quarantine. If this could be done we would spend less time on checking the quarantine because we don't let it go to the junk e-mail folder of the users.

Can this be accomplished by "Tenant allow/block list"? :

Cheers

Answer 1

The Tenant Block / Allow List doenst drop the messages, it only processes them based on your existing anti-spam policies. So in other words, if you move spam to the quarantine, messages you block in the Tenant Block List will go to the quarantine as well:
https://ingogegenwarth.wordpress.com/2022/01/26/when-block-is-not-block/

If you want to drop a message completely, use a transport rule

https://learn.microsoft.com/en-us/exchange/policy-and-compliance/mail-flow-rules/actions?view=exchserver-2019

Answer 2

@Tonito Dux

As AndyDavid said, EOP handle blocked emails based on your anti-spam policies.

Based on my testing, emails sent from blocked sender will be judged as spam and show in recipient "Junk Email" folder by default. So, you could use a transport rule to delete that email directly (Add this user a Mail Contact from Exchange online admin center, then you will could delete emails from transport rule).

You also could block emails which sent from a specific domain:

Please note, if email was judged as quarantined email (Stopped at step 1 or 2), transport rule will not apply on it:

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