Dec 20 2022 10:41 AM
I work with a hybrid environment where almost all of the user accounts are now 365, but there are still some distribution lists that have not migrated yet. I have a particular on-prem Exchange 2010 dynamic distribution list that will not allow a 365 remote mailbox user to send to it. They are a third user, and the other two (also 365 remote mailbox users) can send to it just fine. Their accounts are all on the same domain as the dynamic distro, yet the third user (recently added to authorized senders list) cannot send. All users authenticate to the domain with the same tools, yet my third user cannot send to this dynamic distro. The "Require that all senders are authenticated" is checked and hasn't been an issue. Given the nature of the distro list that authentication requirement remains in place.
What am I missing? What do I need to check/test?
v/r,
George
Dec 21 2022 06:25 AM
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Dec 22 2022 03:00 AM
Dec 22 2022 01:19 PM