Update 5/6/2025: Please see Directory Based Edge Blocking Now Available for Public Folders & Dynamic Distribution Groups for updated information on this subject.
Note: this solution is for hybrid d...
Updated Jun 05, 2025
Version 5.0
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Office 365 Directory Based Edge Blocking support for on-premises Mail Enabled Public Folders
I still have a problem with MEPF 's (On-Premise Exchange 2010 only) and EOP.
If a MEPF is member of a E-Mail activated security group and a mail is sent to this group, the mail won't get delivered to this MEPF.
Only the other members like mailboxes or other E-Mail activated groups receive the mail.
No NDR is sent to the sender.
Within Exchange Admin Center the MEPF isn't displayed as member.
If i sent an E-mail directly to the MEPF E-Mail address it will be delivered to the MEPF.....
Is this a supported scenario?
Any ideas what could be the reason why the mail is not sent to the MEPF?
This is not a scenario that is in the scope of currently introduced MEPF feature in AAD Connect tool. You can raise a ticket to initiate further investigation on the issue.
- I have the same issue (which I think is the same as Aleh describes below).
I have an hybrid Exchange setup with on-prem Distribution List, with 35 users and 1 MEPF. For on-prem users this works fine. For users with mailboxes in Office 365, when they email the DL, the email is received by all 35 people but never to the MEPF. The sender never gets an NDR either.
I have the latest version of AAD Connect, I ticked the box to enable sync'ing Exchange Mail Public Folders, and confirmed I have Microsoft Exchange System Objects ticked in 'Domain/OU Filtering' section. After running a sync, I can see in Synchronization Service Manager that all my MEPF's have sync'd sucessfully (no apparent errors).
However, when I try to send an email from an O365 mailbox user to the DL, it doesn't arrive - no NDR also.
Is there somewhere in O365 Admin Centre to view the MEPF's? There is a tab for Users (Active Users, Contacts, Guests) and Groups (Groups and Shared Mailboxes) but nowhere to see smtp addresses for MEPF's.
If I expand the DL in Admin Center, I don't see the MEPF either.
Emailing the MEPF smtp address directly from an O365 mailbox works fine.