mail/mailutils: import package from wip.

GNU Mailutils is a swiss army knife of electronic mail handling.
It offers a rich set of utilities and daemons for processing e-mail.

All Mailutils programs are able to operate on mailboxes of any existing
format, ranging from standard UNIX maildrops, through maildir and up to
remote mailboxes, which are transparently accessed using IMAP4, POP3 and
SMTP.

(vins)