"Outbox" or outgoing mailbox before a message is sent
I've had problems a couple of times where an email doesn't successfully get sent. Airmail gives me an error message (in this case, "Cannot send mail error [message subject] Unable to authenticate with the current session's credentials."
Now I can't find the message anywhere, so that I can choose to either copy it into a client that's running correctly (i.e. go into gmail on Safari) OR at least tell Airmail to cancel this message.
A bit concerned that I'm going to write the email in Safari, send it normally, and then whenever my problem is fixed in Airmail, it will get sent again (and I'll have to explain this to the recipient, which in this case is a professional client. What a pain!)
I don't know what can be done about this but having an "outbox" in which I can access, pause, or delete messages before they are sent, might be helpful.