550 5.7.13: no permission to post to the public folder
Delivery to a mail-enabled public folder failed because the permission the sender falls under does not allow creating items in it.
- Microsoft
- Provider
- Permanent (5xx)
- Class
- Sources checked
- Author
At a glance
- Code
- 550 5.7.13
- Temporary or permanent
- PermanentRefused for good: the message comes back to the sender, and resending it gets the same answer.
- Who has to act
- The recipient's side. Their mail admin has to change something; you can tell them.
- What the server says
550 5.7.13 STOREDRV.AuthenticationRequiredForPublicFolder
What it means
When a message arrives at a mail-enabled public folder, Exchange Online writes it under a folder permission: Default for internal users sending from a shared mailbox with Send As or Send on Behalf rights, and Anonymous for external senders. If that permission cannot create items, the message bounces with 550 5.7.13 STOREDRV.AuthenticationRequiredForPublicFolder. The folder admin fixes it by granting CreateItems to the right permission. Microsoft also groups 5.7.13 with 5.7.135 for folders that reject outside senders.
Common causes
- The Anonymous permission on the folder cannot create items, so external mail fails.
- Internal users sending from a shared mailbox fall under the Default permission, which also cannot create items.
How to fix it
- 01Ask the folder's organization admin to grant the permission.
- 02Admins: check the folder permissions with Get-PublicFolderClientPermission.
- 03Grant CreateItems to Default for internal senders, or to Anonymous for external senders, with Add-PublicFolderClientPermission.
Sources
What this page rests on, checked on 20 Oct 2026. The explanation is ours; the reply text is the server's.
Related codes
- 550 5.7.135Public folder rejects mail from outside.The recipient is a mail-enabled public folder set to reject messages from senders outside its organization.
- 550 5.7.1Public folder does not accept external mail.An external sender wrote to a mail-enabled public folder in Microsoft 365, which by default accepts mail only from authenticated senders.
Further reading
All 111 Microsoft codesEvery code in the wikiPaste your own bounce