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Mail message: The server returned the error: Mailbox doesn't exist: INBOX.Drafts

This message keeps popping up while I am composing an email:

The message “Test” could not be moved to the mailbox “MyMailboxName”

Mail was unable to open this mailbox on the server “mail0.hostingplatform.com”.

The server returned the error: Mailbox doesn't exist: INBOX.Drafts

How do I correct whatever the problem is?

Thanks

MacBook Air 13″, macOS 12.6

Posted on Oct 17, 2022 10:04 AM

Question marked as Best reply

Posted on Oct 17, 2022 11:08 AM

I'm not sure, but I think the problem is your IMAP path prefix is wrong. It seems to want to put everything into the Inbox instead of the level above inbox. When you are creating a new message, a draft is synchronized to the server Drafts folder.

Another possibility is the Mailbox Behaviors has somehow set the Drafts folder as a subfolder of Inbox.

Both of those can be found in the Mail Preferences, Accounts. The IMAP Path Prefix is in Advanced IMAP Settings under Server settings. The Path Prefix is normally blank.

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the server returned the error: client tried to access nonexistent namespace. (mailbox name should probably be prefixed with: inbox) Apple Mail

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Outlook keeps trying to send a nonexistent message while Outbox folder shows zero messages

• Article
• 01/30/2024
• Applies to: Outlook for Microsoft 365

In this article

Symptoms

You experience one or more of the following problems when you use Outlook:

• Outlook continuously displays a message such as "Sending message 4 of 6" in the Progress bar even though there are no email messages queued. Additionally, Outlook stops responding when you try to close it. For example, you see the following message in the Progress bar:
  
  You may also receive an error message that resembles the following: Task '[email protected] - Sending' reported error (0x8004210b) : 'The operation timed out waiting for a response from the sending (SMTP) server. If you continue to receive this message, contact your server administrator or Internet service provider (ISP). The server responded: 550 5.1.0 <> sender rejected. AUP

  O-1580'

  
• You are continually prompted to log in to internet email.
• Outlook displays a number next to the Outbox folder (for example: Outbox [4]) even though there are no messages in the Outbox.

Cause

These problems are caused by a read receipt that is stuck in progress and that Outlook keeps trying to resend.

Workaround

Use the MFCMAPI tool to delete the stuck messages. To do this, follow these steps:

Important

Make sure that Outlook is closed during this procedure.

Note

If you have the 64-bit version of Outlook installed, you must install the 64-bit build of the MFCMAPI tool.