WiscList owner would like to preserve @lists.wisc.edu address after migrating away from Lyris so that messages sent to the old address will not be bounced
Assuming that split hosting @lists.wisc.edu between multiple services (O365 & Google) would be too problematic, and that Google Groups is the most appropriate future home due to Google Groups having traditional "list" capabilities.
Stakeholders at the DoIT Infrastructure Coordination meeting identified this (@lists.wisc.edu address / mail flow preservation) as a requirement.