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FAQ says mailing lists are not allowed to be in groups. instead of this we should have an audit process to see how a mailing list is configured and map that to groups a list is allowed to be in. See https://engineering.redhat.com/rt/Ticket/Display.html?id=423546#txn-8668146 Need to have a process for initial and on going auditing.
Tested on QA environment(5.0.3-rh15) Result: Pass