Once you run twenty sending mailboxes, every routine change is twenty edits. Pausing all of them because a domain is under review, or updating the IMAP settings after a provider change, was a morning's work.
Mailbox management now supports bulk actions: toggle on or off, update shared settings, and delete, across a selection. A detail drawer opens a single mailbox in place for inspection, so checking one does not cost you your position in the list.
The mailbox form was simplified at the same time — one toggle per protocol, configuration fields always visible, so it is clear what is on and what is off without expanding anything.