The *postfix* role will now generate configuration and a lookup table
for [canonical address mapping][0] of email recipients. To configure
the mapping, the `postfix_recipient_canonical_map` must be a dictionary
of source-target addresses, e.g.:
```yaml
postfix_recipient_canonical_map:
my.bad.email@fake.test: my.real.email@example.com
```
[0]: https://www.postfix.org/ADDRESS_REWRITING_README.html#canonical
The value of the `shlib_directory` is dependent the system architecture.
Specifically, x86_64 machines use `/usr/lib64/postfix`, while everything
else uses `/usr/lib/postfix`. This role was originally deployed on a
Raspberry Pi, so the original path was correct. Attempting to deploy it
on an x86_64 machine revealed the error.
This commit adds a new task that loads a variables file based on the
architecture. Each option defines an `arch_libdir` variable, which can
be expanded in the `postfix_shlib_directory` variable as needed.
The *postfix* role installs and configures the Postfix MTA. It currently
supports a number of modes, including direct transfer and relay. Relay
mode supports STARTTLS security and PLAIN authentication.
Dustin