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Email Gateway fails delivering emails to external recipients in a distro list

We are experiencing an issue with the cloud gateway.

The product has been in service for about 36days and it seems for those 36 days no external partner has been able to receive emails from our distro list.

If we send an email to the distro they get it, however the emails from external partners and are failing on attempts to deliver to any external partner.

If I disconnect my O365 outbound connector, will the emails then pass thru O365 instead?
I've tried creating a new connector rule that has a few domains listed that are known to fail and set the transport to check for MX vs the relay.

That seems to not work either.

Anyone else facing similar issues that can shed some advice?



Added tags
[edited by: Raphael Alganes at 3:54 AM (GMT -7) on 7 Jun 2023]