Why is all our email that we send to users with hotmail.com email
adddresses getting bounced? (We send only a few messages to
subscribers, where subscribers email addresses are placed in the BCC
field.) Is hotmails use of Brightmail blocking our mail? If so, what
can I do to get around the problem?

Here is one of the returns (x's used for privacy):
       Reporting-MTA: dns; xxxxxxxx03.attbi.com
Arrival-Date: Wed, 25 Sep 2002 00:24:47 +0000
Received-From-MTA: dns; xxxxxxxx (xx.xxx.xxx.xxx)

Final-Recipient: RFC822; <xxxxxx@hotmail.com>
Action: failed
Status: 4.4.7
Remote-MTA: dns; hotmail.com

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Request for Question Clarification by pwizard-ga on 17 Oct 2002 12:31 PDT

Can you verify that every single person you are sending to with a
hotmail address is being bounced, or is it just *some* of them? Also,
have you ever been contacted by one of the large anti-spam
blacklisting companies about the possibility of being added to their
list of blacklisted domains?

There is no additional information, in an attachment for example?