moderated Re: Messages to +owner being wrongly routed to the whole group
Groups.io may be the only organisation that has chosen to embed a "+"Gmail is another.
It uses + in the user part as the lead-in for an alias address. That feature won't work properly with messages sent from a synchronoss afflicted service.
so we may get no support for any campaign to get it fixed properly.You can add to your leverage by telling them that they're breaking a Gmail feature.
(the "Use Gmail aliases" section at the bottom of the page)