We finished moving the pm.org mail over to the perl.org servers just now. One sideeffect is that usergroup-pm at pm.org should work again. We are also deprecating using mail.pm.org in the email addresses, but we'll keep them working for now (and probably for a year or three).
(send your virtual or real beers to Robert for having endured dealing with mailman for us through this process!
If something doesn't work, then send us mail at ask or robert @perl.org.
oops Robert just pointed out that we didn't move the config for mail @usergroup.pm.org. That'll be working again shortly