Mail App
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