The documentation and package description for mailutils claims that GSSAPI
is supported for imap.  While imap4d does support gssapi, the client programs
do not, because there is no support for gssapi in libmailutils.

This is not a wishlist item as things stand, because the programs do not
behave as the documentation claims.  If the documentation is fixed, then this
becomes a (very important) wishlist item.

Why very important?  Because the mailutils client programs otherwise cannot
support Kerberos at all.