Settings > Backup & reset gets "Keep mail on this device", off until the
user turns it on in this browser. While it is on:
- the JMAP client hands the server's answers to an encrypted cache in
IndexedDB (AES-GCM, non-extractable key) and answers from it when the
network is gone: the folder list, the last 30 days of the Inbox and of
the folders the user opened, bodies and attachments, at most 250 MB,
oldest out first; a background sync keeps it current
- read, flag, tags and moves made offline are queued and sent in order
when the server answers again; deleting for good and emptying a folder
are refused offline
- the composer, quick reply and the S/MIME and PGP plugins' sends that
complete the composer's go to an outbox once every step up to the
transport ran (checks, label, signature, plugin send checks); only the
finished send waits, with files attached offline
- the service worker keeps this build's app shell, so the app also
starts offline from the kept session and the last policy
- a full sign-out, the idle sign-out and signing one account out delete
it, a sign-out the user starts asks first when mail is unsent, and the
login page names what an automatic sign-out deleted; a policy fetch
that forbids it (devices.noOffline) wipes that account
Not in Lite.
Message ids repeat across accounts, so a hook payload naming only an
emailId could not tell a plugin which mailbox the message lies in when
it is a shared or group account's.
onBeforeEmailStarToggle and onEmailStarToggle now carry accountId when
the starred message is not in the user's own account, as the
message-row-actions click context does. Every star (the row's button,
the reader's star, the key, the menu) goes through toggleStar, one
message at a time, so one accountId names it; the account is resolved
before the plugins are asked. An own message's payload is unchanged.
onAfterEmailSend now carries accountId, the JMAP account the sent
message lies in (a mail sent from a shared or group identity lies in
that account), so api.email.get finds it. sendEmail returns that account
as emailAccountId, the S/MIME send too. The hook also carries
composerId, the id the sending composer's slots and actions gave
plugins, so a plugin can act on what the user chose in that composer.
Linus Rath
Jacob Zeitz