Hello all!
I'm currently in the process of getting our On-prem Exchange connected and eventually migrated up to Office 365. The current setup is essentially World-->Email Appliance 4.2.1-->Exchange. In the future I would still like to utilize it so it would add O365 to the end of that, however I also want to maintain the outbound mail going through Sophos for compliance reasons.
So the future flow would be O365-->Sophos-->World, when I tested that Sophos kicked it back with a Relay denied (Reason: [{LED=454 4.7.1 <EMAIL>: Relay access denied}). I added in the office 365 .onmicrosoft.tenant.com address but it s till refusing. There's a place to add singular IP addresses as a "internal sender" however I dont' feel comfortable adding all those, in addition it doesn't seem to accept ranges.
Is there a way to have that kind of configuration with Email Appliance and Office 365?
Thanks in advance for your help~!
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