As we're currently in an Office 365 environment where we used to have Cloud distribution groups. Because we're looking to move back to our local Exchange server again I made some preparations already in case we switch back. This might save my some work in the future!
Since we moved from the cloud 'created' security group to the Active Directory Synced Security group with e-mail people are flagged as 'fraudulent' whenever they send an e-mail to the distribution group. I didn't change a thing on my SPF records or mailserver itself, so I am not really sure what's causing the trigger.
We're using the exact same distribution group e-mail address. The only difference is that it's created and synced from our local Active Directory instead of an Office 365 created distribution group.
Could anyone tell me what the possible cause is of this issue and if there is a way to fix this without reverting back to the cloud created distribution group?
Thanks a lot in advance!