grepmail

A useful mode for grepmail would be to have it emit an
imap: url (RFC2192) for each message that matches the
search criteria. The server name and path prefix on
that server would be the argument to the option.

The result would use the X-UID header if present to
provide a URL in the
imap://<iserver>/<enc_mailbox>[uidvalidity]<iuid>
format, else it would employ a search for the
message-id using the
imap://<iserver>/<enc_mailbox>[uidvalidity][?<enc_search>]
format.