The proton@q.a.o mailing list will merged into the users/dev lists, as you may already be aware from recent threads.
As part of this, around 50 subscribers to proton@ who are not also currently subscribed to users@ will be subscribed to the users@ list. The proton@ list will then be retired and its list address aliased with users@. I will raise this request with infra next week. If you fall into the group of people not subscribed to both those lists already and wish to subscribe to users@ before that time, you can do so by following the subscribe instructions at http://qpid.apache.org/discussion.html. Alternatively, if you are in the group and do not wish to be subscribed to users@, you may unsubscribe from the proton@ list before then by following the unsubscribe instructions on the same page. Development related traffic such as mails from JIRA and GitHub will move to the dev@ list (also see the above page if wishing to subscribe there). I will raise requests with infra to that end shortly. Regards, Robbie