[MM3-users] mail stuck in "out" queue

I've had encountered this situation now twice: mail is being stuck in "out" queue and nothing in the logs indicates the issue. Is there a way to ask mailman-core politely to attempt delivery (perhaps with increased debugging in the logs) *without* restarting the core (which does solve *this* problem but creates other problems, like availability of the mailman as a whole)

-- Sr System and DevOps Engineer SoM IRT