Release 0.18.1 highlights:

# Fixed

- Startup error if `log-file` directory does not exist.
- Aerc is now less pedantic about invalid headers for the maildir and
  notmuch backends.
- Error when trying to configure `smtp-domain` with STARTTLS enabled.
- `smtp-domain` is now properly taken into account for TLS connections.

Thanks to all contributors!

~$ contrib/git-stats.sh 0.18.0..0.18.1
Author        Commits  Changed Files  Insertions  Deletions
Robin Jarry         4              7         +68        -72
Jens Grassel        1              1          +5         +0

Reviewer/Tester     Commits
Tristan Partin            2
Bence Ferdinandy          1
Inwit                     1
Moritz Poldrack           1
Robin Jarry               1
Vitaly Ovchinnikov        1
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