If you have Microsoft Exchange accounts then you get a different bug. If you have no network connection or change network connections Apple Mail will thrash acc

If you have Microsoft Exchange accounts then you get a different bug. If you have no network connection or change network connections Apple Mail will thrash accountsd for long periods of time consuming as much of the CPU as it can. Neither Apple Mail nor accountsd appear to have any throttling of network connection attempts. Quitting Apple Mail until you have a network connection is the only option.