I keep getting this message every time I am sending or writing a message on my mail app. Could you please explain what I need to do?
Mail was unable to open this mailbox on
the server "mail.redtape.com.pk".
The server returned the error: Client
tried to access nonexistent namespace.
(Mailbox name should probably be
prefixed with: INBOX.) (0.001 + 0.000
MacBook Pro 13″, macOS 10.13
Welcome to Apple Support Community!
If you can't send or receive emails on Mac > https://support.apple.com/en-us/HT204075
I would follow that resource above, as it contains good troubleshooting for your type of issue.
If all else fails, I would attempt to remove the mail account and re- add it.
If you are having to enter your third party email manually, you may need to get the specific mail server settings for that ESP.
If you need help getting those mail server settings you can visit Apples Public page to obtain those.
If you are unable to locate those settings using Apples Mail Support website, you will need to contact the Email Service provider
Apple Mail Support : https://support.apple.com/mail
Hope this helps ;)
Yes I can it’s only happening on my laptop.
Mail App
