Stalwart sends `NOTIFY=DELAY,FAILURE`
to request Delivery Status Notifications.
aiosmtpd does not support any parameters,
not just ORCPT, so we have to ignore all of them.
- username_min_length and username_max_length are both set to a
default value of 9 in the chatmail.ini.f template. When they have
the same value, it doesn't matter which one we use in newemail.py
(which handles the /new URL). However, if they are configured to
different values by the admin, then the current implementation using
username_min_length chooses from a smaller set of possible
usernames.
- Revised create_newemail_dict() in newemail.py to use
username_max_length as the length of the random username it offers
via the /new URL. This randomizes within a much larger set of
possible usernames.
- Implemented changes suggested in review by missytake:
- Removed relation between acmetool-redirector and certs.
- Added internal nginx listening on port 8443.
- Changed direction of arrows between certs and the services that
use them. This makes the arrow show the direction of
information flow, rather than a "depends on" relation.
- For filesystem paths, added a descriptive name to the node.
- Replaced most arrows with plain lines, to simply show that a
relationship exists between the two nodes. This also reduces visual
clutter, since the graph is pretty dense with information already.
- Split nginx and certs into two nodes, to reduce entanglement in the
graph. These "linked" nodes are given a different shape and filled
with a different colour, to highlight the fact that they are the
same node.
- Revised text about the meaning of edges in the graph.
- For starters, this file is just a diagram of components of a
chatmail server. In the future, this document can grow into a more
complete description of the architecture of the server, the
deployment process, and the design intent behind what is and isn't
in the code base.
- The name ARCHITECTURE.md is inspired by this article, which also has
good suggestions about what to put in the file:
https://matklad.github.io/2021/02/06/ARCHITECTURE.md.html
