For the two or three days, IMAP has been failing intermittently - with messages about internal errors.
When my MUA tries to save a draft, it almost always fails, and retrying doesn't help. When saving Sent messages, it often fails, and retrying sometimes helps.
Filing messages or moving between folders works sometimes, and sometimes it fails.
Really really unreliable.
I've been using IMAP for many years, and am using the same client I've been using (Thunderbird) that I've been using for all this time. The IMAP server is giving return codes for internal errors.
Is this being looked at?