Has anyone been able to figure out how you can re-order mail accounts in mail? With Yosemite and previous versions it was as simple as just dragging the accounts in the order desired. The re-ordering works in 10.11, but once you close Mail, the order resets to the default (i.e. the order the mail accounts are listed in the Internet Account preference pane). The work-around of unticking "mail" in all accounts and then ticking it in the order desired is also only temporary until Mail is restarted. Only option seems to be to delete all mail accounts and then create in the order wanted.