This patch implements "via" aliases, which let us explicitly select a
server to use for delivery.
This feature is useful in different scenarios, such as a secondary MX
server that forwards all incoming email to a primary.
For now, it is experimental and the syntax and semantics are subject to
change.
We have a few Python scripts which over the years ended up with a
variety of formatting.
This patch auto-formats them using `black -l 79` to make them more
uniform, and easier to read and write.
This patch makes mail_diff more strict in its parsing, to ensure we
catch any encoding issues that may otherwise be masked by the default
compatibility policy.
Python 2 is approaching end of life, and we only need it to run
the mail_diff test utility.
This patch updates mail_diff to run on Python 3, which only needed minor
changes.
This patch adds a test for delivery status notifications and null address
deliveries, that check that chasquid can both receive and send DSNs.
To do this, we extend the mail_diff utility to support wildcards in the
comparisons, to skip over variable parts of the messages (like dates).
This patch adds checks that verify:
- The envelope from must match the authenticated user. This prevents
impersonation at the envelope level (while still allowing bounces, of
course).
- If the destination is remote, then the user must have completed
authentication. This prevents unauthorized relaying.
The patch ends up adjusting quite a few tests, as they were not written
considering these restrictions so they have to be changed accordingly.
This patch introduces a new directory, test/, which contains a simple local
end-to-end test which runs a chasquid binary and uses msmtp to send an email,
which is delivered locally.
As it's the first one, it adds a bunch of common infrastructure to simplify
writing these kinds of tests.
More end-to-end tests will follow, and it's expected that the common
infrastructure will also change significantly to accomodate their needs.
