Erroneously deleted what I thought was a duplicate (Sent) mailbox.

On my MacAir laptop, I've had two mailboxes each for Inbox, Sent & Draft. The first ones are listed under "favorites' and second ones are under the listing "iCloud". I initially moved the "iCloud" Sent mailbox up into the "Favorites", thinking it would combine or merge, but it didn't, so there were now 2 Sent mailboxes in "Favorites" and a copy still under "iCloud". So, I highlighted the "iCloud Sent mailbox (in "favorites") and deleted it, and that resulted in total deletion of all the emails in both Sent mailboxes...and the "iCloud" Sent mailbox is now listed as iCloud and not active. Can I get back the Sent emails?