Import mailutils-2.2 as wip/mailutils.

GNU Mailutils is a rich and powerful protocol-independent mail
framework.  It contains a series of useful mail libraries, clients,
and servers.  These are the primary mail utilities for the GNU system.
The central library is capable of handling electronic mail in various
mailbox formats and protocols, both local and remote.  Specifically,
this project contains a POP3 server, an IMAP4 server, and a Sieve mail
filter. It also provides a POSIX `mailx' client, and a collection of
other handy tools.