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Office 365 public folder mail from outside

Office 365 plan E3. One public folder, enabled email and it works when users from the same domain sends mail. Have set the anonymous to have write items. When external users sends mail this is the response.

The message was rejected by the recipient's domain because the recipient's email address is not listed in the domain directory. You may e-mail address is misspelled or does not exist. Try to solve the problem by doing one or more of the following:
1.Send message again, but delete and enter the address again before sending the message. If your email program automatically suggests a link you can use, do not choose it. Enter the full email address.
2.Empty list for autocompletion of recipients in e-mail program by following the steps in this article. Then send the message again.
For email administrators
 Directory Based Edge Blocking (DBEB) is activated for the recipient's organization, and the receiver was not found in the directory. If the sender is using the correct address, but the problem still exists, contact the recipient's e-mail administrator and tell him or her problem. The problem can be solved by synchronizing the local directory and directory in the cloud again.

Remote Server returned '550 5.4.1 [xxxxxxxxxxxxxxxxx]: Recipient address rejected: Access denied'
Microsoft 365

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Vasil Michev (MVP)

8/22/2022 - Mon
Vasil Michev (MVP)

Hm, seems like the smtp addresses for PFs are not being synced with DBEB. You can disable DBEB by changing the domain type to InternalRelay (O365 admin portal -> Exchange -> Mail Flow -> Accepted domains -> double-click the domain), it should start working after 30mins or so.

I'll try to get an answer from Microsoft if this is the expected behavior, but that will probably take some time due to the holidays.

ok, i will try to disable DBEB to see if that helps.
Vasil Michev (MVP)

Well it helped for me. Here's the deal - it will work just fine for the initial address. For any additional smtp addresses you configure later, it will give the same NDR (unless you disable DBEB that is). Seems that they are not syncing back any newly added aliases to the egde nodes...
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James Murphy

ok, i disabled DBEB and it works, thanx :-) But is there some problem disable DBEB? i see that sending to a non existing address creates a hop count exceeded error and not the normal user dont exist. Is it possible to manualy sync smtp addresses to the edge nodes?
Vasil Michev (MVP)

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