Before, sending was done synchronously on the api/send POST call. Now
we just build the MIME message and mark the message for sending, and
queue the actual SMTP (or internal) sending for the worker. We use
this opportunity to add fine-grained delivery statuses for each
recipient, something that traditional email systems are unable to do!
Expanding on that, this (too large) PR adds an initial Elasticsearch
index of threads. It also overhauls the build and CI system, using
Poetry instead of Pip.
You can now send emails to the inbound MTA, which will forward them
to the Django MDA. You can then read them (served through REST) from
the frontend and compose a reply! The frontend will POST the message
to Django, which will build an RFC5322 message and send it to the
outbound MTA, which will relay it to the local mailcatcher where you
can view your reply. Phew!
Initial documentation in the README but this is the core loop that
will be expanded upon, with diagrams and videos!
