Mail’s “Sending…” Source
Once you click on the “Send” button, the message actually disappears from the “Drafts” mailbox, and the “Sent” mailbox changes to “Sending…”
…where is the message that is currently in the process of being sent? It’s not in the “Sent” box, as we have just seen. It’s no longer in the “Drafts” box either, as you can see in the screen shot. (The message count next to it is back down to nothing, i.e. zero.) So where is it? Well, that’s the kicker: It is nowhere. It is not in any visible part of the user interface in Mail.
