Question: Lost "sent" mailbox
Somehow I've lost the "sent" mail box in one gmail account (IMAP).
One account of 3. In the other 2 accounts the "sent" boxes are still there. And mail from those accounts shows up in them.
When I go the web mail page for the account in question - there is a "sent mail" box there with recent messages.
I've looked in OS's Library and found an account named AosIMAP-gene4318 that has a sent mail folder but does not show recent activity (I just sent email from that account)
There's another account named IMAPemail@example.com that does not have a sent mail box in it.
The AosIMAP-gene4318 and MAPfirstname.lastname@example.org are a mystery to me. i.e. I don't know the significance or how they are different.
How do I get the missing box back?
Running: OS X 10.10.5 (Yosemite ) Mail ver. 8.2
Mac mini, OS X Yosemite (10.10.5)