Hello,
We have a monthly report emailed to a user mailbox setup to forward all email to global security group and until this month was working fine but will no longer go through. If I disable forwarding I am able to see the email come through to the inbox. I have done a mail trace and am able to see it being sent to the DL. We are setup with a on premise AD using dirsync to O365. I have triple checked all rules and settings everywhere and am at a loss. I cannot figure out why its not forwarding to our "all" DL anymore.