Sophos Email customers using IP-based mailflow rule connectors must migrate to certificate-based configuration by March 31st. To see if you're affected Click Here.

Mail Flow and DMARC's

Hopefully this is a quick question and I totally missed other comments.  Current config

Email Protection - MailFlow is configured via Sophos Central and O365 rules are there and all is working as expected

Question: If I change my Public DNS DMARC to quarantine will O365 catch it first or does that rule Sophos made still supersede anything that O365 will do (Can't completely disable O365)

Question:  Do I need the public DNS DMARC or can I do the same things within Sophos?

A lot of this is answered in discussions but they seem to go into Email Gateway discussion but doesn't seem very clear in Mail Flow configurations.

Any clarification is apricated. 

Added TAGs
[edited by: Raphael Alganes at 3:39 AM (GMT -7) on 14 Mar 2024]