Hi,
Yes, I got it at least twice in the last few days. Also with FastMail.
It happened when I would try to send a message.
Quitting and relaunching MailMate fixed it and allowed the message to
be sent (I think I had FastMail open in the browser in the background
and could see that the message was sent only after relaunching).
My fix is typically to delete the offending message from my Sent Items
list in MailMate, and then quit/restart and synchronise the mailbox, or,
I will export the messages (this morning it was five or six messages)
into an "mbox" format, then delete them from MailMate, quit MailMate,
then use Mail.app to re-import them to IMAP (works fine), and re-start
MailMate.
Not ideal, but, it prevents me losing mail.
(If it matters, Benny, I tend to use command-return as a shortcut to
send messages)
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