#5506 "Email outbox: a table of outgoing email and a sender that retries
until accepted, for up to an hour" (milestone 501).
- email_outbox (migration 0042) holds each message per recipient, its
words, its state (held / pending / sending / sent / failed), attempts and
the server's last answer. email_outbox_events links alert events for
#5507.
- core/outbox.py: enqueue; a sender task every 15 s claims what is due
(SKIP LOCKED, stale claims released), sends the batch over one
connection with no session held, and settles each row:
- accepted -> sent;
- a 5xx refusal -> failed at once with the server's words;
- no connection, a timeout, a 4xx -> retried after 30 s, 1, 2, 5, 10,
15 min, the last try at the hour, then failed;
- a test (retry=False) settles on its first answer.
It runs on startup, so a row left by a restart goes out at boot.
- notifications.smtp_open is the one place a connection is opened.
- mail.message takes the html part as optional.
- cleanup ages email_outbox rows on the data window.
Senders move onto it in #5507 and #5508.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
