Exchange 2016 using Outlook 2016 client
Created a new Public Folder titled
Mail-enabled the public folder:
Enable-MailPublicFolder -Identity "\PublicFolder"
Added Send As permissions.
Add-ADPermission PublicFolder -User domain\jsmith -Extendedrights "Send As"
Added permissions to receive mail.
Add-PublicFolderClientPermission -identity "\PublicFolder" -User Anonymous -AccessRights CreateItems
Set Hidden from address lists false:
Enable-MailPublicFolder -Identity "\PublicFolder" -HiddenFromAddressListsEnabled $False
The user jsmith is an owner of this public folder. He can add the public folder and the public folder can receive emails but nobody is able to "Send As" the public folder.
Under EAC I have verified that the public folder exists, permissions are in place, and the folder is mail-enabled.
I have tried disabling Mail Settings and re-enabling. I am also completely unable to select "PublicFolder" in my "From" field in OWA. It gives no option to enter a custom name and also doesn't have an option for the PublicFolder. I did add it to my Favorites.
The user receives the message "This message could not be sent. Try sending the message again later, or contact your network administrator. You do not have the permission to send the message on behalf of the specified user. Error is [0x80070005-0x0004dc-0x000524]."
The user has both Send As and Send on Behalf Of permissions.
The issue has lasted more than 24 hours so I am fairly certain that it is not a replication issue.
This kind of issues might be caused by a wide range of issues:
More infos can be found in the source URL.
In your situation it looks like this is caused because the user has both "Send As" and "Send on Behalf Of" permissions. So please check solution 1 and fix the permission.
After long hours of research about this issue, this is the way to solve error
0x80070005-0x0004dc-0x000524 given by a send as on public folder.
It works for me and hope it will be the same for you. => Works for Exchange 2013 and Outlook 2010 & 2013.
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