Email Protection Basics in Microsoft 365: Anti-malware, Safe Attachments, and Quarantine

chrislehrPatriot Thanks for sharing this feedback. We do have it in the backlog to support Quarantine policies for Exchange mail flow (transport) rules but no set timelines as of yet. We will inform of the same once we have a rough timeline. Stay tuned. 

You could also modify the ETR action from "redirect to hosted quarantine" to "set Spam Confidence Level" to 9 (for example). Doing so will trigger the high confidence spam actions for the messages processed by the rule, as well as their assigned quarantine policies.

furqannzr You could 1) create a custom anti-malware policy, 2) scope it to certain users and domains, and 3) remove the file types from the common attachment filter for that scoped policy. Word of caution if you do that: make sure to cover these files another way, such as using mail flow rules as described in the article. Setting up any permanent or overly broad overrides and turning off the common attachment filter completely is not recommended. For more information, see 

Use mail flow rules to inspect message attachments in Exchange Online and  

Common attachment blocking scenarios for mail flow rules in Exchange Online.