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When a local account address is forwarded, the mails were not locally
kept. This was due to the way lookup tables were internally managed.

Instead of using lists to represent Postfix lookup tables, we now use
attribute sets: they can then be easily merged.

A regression test for
https://gitlab.com/simple-nixos-mailserver/nixos-mailserver/-/issues/
has been added: it sets a forward on a local address and ensure an
email sent to this address is locally kept.

Fixes #205

The line type of this option make its concatenation cleaner: the user
doesn't have to manually add `\n` to its policydSPFExtraConfig value
when debug in set.

The version 0.0.3 of hydra-cli prints the jobset details on error.

This database is huge and can be fetched at build time.

Fixes #197

The test also checks the connection on the imap port 993 is a SSL
connection.

This test is used to test feature requiring several mail domains, such
as the `forwards` option.

This option allow to forward mails to external addresses.

The goal is to remove the WIKI since modifications can not be
submitted via PRs.

Currently oneshot services are not re-run on NixOS activate and that
meant that you needed to manually restart `gen-passwd-file` for new
users to be available.

This commit removes the `gen-passwd-file` service and instead simply
calls the same script in the dovecot2 preStart.

This might prevent misconfigured clients to use a weak cipher when stronger ciphers are available.

TLSv1 and TLSv1.1 are commonly opinioned as deprecated.