Sendmail aliases[1] supports expansion to a file ("/path/name") or
pipe ("|command"), as well as file inclusion (":include: /path/name"),
however, our implementation does not support such functionality.
[1]: https://www.freebsd.org/cgi/man.cgi?query=aliases&sektion=5
Signed-off-by: Eric Sunshine <sunshine@sunshineco.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>