No one is working on this package now. You can visit pkgdb for links to the
Ask for Python 3 status, and coordinate work with the upstream to port.
If upstream has Python 3 support but it is not yet in Fedora,
get in touch with the Fedora maintainer (also visible in pkgdb).
Mailman 3 with Python 3 support is ready but should be packaged separately.
More info on the status of the new package can be found in a