Hi all, Public Folders and Hybrid mode. Not really a hybrid mode cause all mailboxes reside in the Cloud, also PF Mailboxes. First set Default PF for all mailboxes.
Get-Mailbox -ResultSize Unlimited -RecipientTypeDetails usermailbox | set-mailbox –defaultpublicfoldermailbox o365PFmailbox
When sending email from outside organization sender will get.
550 5.4.1 Recipient address rejected: Access denied. or
550 5.7.13 Anonymous users are not permitted to add contents to mail enabled public folder, authenticated required. And fixes are.
- Modify Allowed domain to Internal Relay, instead of Authoritative. This is cause Directory Based Edge Blocking (DBEB) block external senders cause the address isnt't inside EOP users.
https://docs.microsoft.com/en-us/exchange/mail-flow/accepted-domains/accepted-domain-procedures?view=exchserver-2019#CreateAcceptedDomain With Exchange Online powershell. Add Anonymous access to CreateItems:
Get-PublicFolder -Recurse | Add-PublicFolderClientPermission -User Anonymous -AccessRights CreateItems
And as an advice, raise PF limits to prevent errors when migrating.
Set-OrganizationConfig -DefaultPublicFolderProhibitPostQuota 10737418240 Set-OrganizationConfig -DefaultPublicFolderIssueWarningQuota 9663676416
