The message “xxx” could not be moved to the mailbox “iCloud”
I'm getting this message today on my MBP Pro 13" with Monterey 12.3.
"The IMAP command “APPEND” (to Drafts) failed with server error: Server Busy. Please try again later. (took 18124 ms)."
I've closed mail several times with no difference.
MacBook Pro 13″, macOS 12.3