so I think the possible options are:

Option 1: move to EL-8 mailman2 til next June.. then punt to 2,3,4

Option 2: volunteer and do the work to make mailman3 work (this needs packaging, webwork, database work, importing of old archives, resubscribing n people, etc).

Option 2b: volunteer and use a different supportable mailing list software (this needs...)

Option 3: discontinue email lists and have Fedora discourse run threads.

Option 4: move the mailing lists to another organization and let them manage the email (this needs ...)