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Sending issue between on-prem, 365 and sophos

Hello everyone, I have a common scenario, this is my email infrastructure, a 2019 exchange server, connected to 365 and I have antispam licensing with Email Advance Sophos; My problem is that when I configure the MX from 365 in the Sophos domain configurations, the emails that go from my premise to 365 do not go outside, it only leaves me with internal communication and exit from 365 to the outside.

I have configured the two sophos mx in my public DNS, also the forwarding rule for all emails in 365 in bypass for sophos, but it does not work.

Thank you very much in advance.

All that emails go to query.

Edited TAGs
[edited by: Raphael Alganes at 8:08 AM (GMT -8) on 21 Feb 2024]