Users with several accounts can save the list of accounts in their browser
(address, server, label, colour) on the webmail server and bring it back on
another device. The list is encrypted in the browser with a password the user
chooses (PBKDF2-SHA-256, 600,000 iterations, AES-256-GCM, owner bound as
additional data); the server stores only the envelope, one file per owner
under SETTINGS_DATA_DIR/account-archives. No mailbox passwords are included.
Off by default behind the admin feature gate accountArchiveEnabled, pinned
off in Lite. Every method of /api/account-archive needs a session cookie of
the owner, matched without regard to case, whose credential is checked
against the mail server on each call; listing included.
Restored accounts this browser lacks are listed as awaiting sign-in: they
survive a reload, and opening one leads to the sign-in form with the address
filled in. Accounts already present get their archived label and colour.
Linus Rath
lucamzanon