[imp] BCC privacy problem?

[Matt Saunders]

Hiya,

I have a list of people who I wish to BCC a single message to (they
are all confirmed opt-in recipients).

However, if I don't put anything in the To or CC fields and only
use BCC, all the recipients end up on the "To" line!

e.g.:

    Message-ID: <1038318968.3de37d78a48ad@webmail.yoyo.org>
    Date: Tue, 26 Nov 2002 13:56:08 +0000
    From: matts@yoyo.org
    Subject: BCC test
    MIME-Version: 1.0
    Content-Type: text/plain; charset=ISO-8859-1
    Content-Transfer-Encoding: 8bit
    User-Agent: Internet Messaging Program (IMP) 3.1
    X-Originating-IP: 212.135.8.3
    To: bcc1@matts.net, bcc2@matts.net, bcc3@matts.net

    All recipients of this mail are in the BCC line.

    -------------------------------------------------
    This mail sent with IMP courtesy of yoyo.org

In this email, all the recipients were BCCed and the To and CC lines
were empty.

This seems to be a privacy problem with IMP, but I've been unable to
find a definitive source that says what the proper behaviour should be
in the absence of To and CC lines but I seem to remember that the MUA
(IMP) should add "To: undisclosed-recipients;" in the absence of any
other To or CC information.

Can anyone please clarify this for me one way or the other?


Matt.
-- 
  Matt Saunders                     matt.saunders@uk.easynet.net
    Services Support Manager          tel: +44 (0)20 7032 7000
      easynet                           fax: +44 (0)845 333 0126