I have seen some environment that have 2 mailboxes servers members of a DAG.
-Now if one server goes down, would the passive database in the second server become active automatically?
-if the defunct server comes back up , would the database that was active in it before it failed will be active again ?
- is it best practice to have a third server? or 2 servers in a DAG will be enough ? just in case the defunct server does not come back up