Retrying Outbox on send failure?

K9 seems to give up sending when it cannot send immediately (for example, when I am in a national park away from cell coverage). The message goes into the Outbox but never retries to send when an Internet connection is re-established.

The old K9 could retry the outbox (and could also do manually). As near as I can tell, the new K9 won’t do this. I can “resend as a new message” manually (which then works), but the old unsent original remains in the Outbox indefinitely until I delete it manually.

Is there a way to convince K9 to retry sending messages (either automatically or manually)?