I created two totally separate Gmail accounts -- one for "private" correspondence and the other for "public." Both are integrated with BIS.

I've been exchanging mail with someone using my "public" address, but they received delivery receipts from both addresses... thus revealing my "private" address! The delivery notices are being generated by BIS even though I'm not using my BlackBerry to write mail (only get notifications and read).

I don't want my real name revealed for privacy reasons! How can I prevent this from happening?

Additional Info:
- In my BlackBerry I have "Confirm Delivery" and "Confirm Read" disabled.
- Gmail doesn't offer any receipt feature.
- From my home PC, I log in to each Gmail account separately via web browser when I send/receive mail from them (not using a client app).
- The Gmail accounts are not linked or forwarded to each other in any way.
- I often Bcc: my "private" account when sending from my "public" account.

In case you aren't following, here's an example:

1. I logged in to "public@gmail.com" and received mail from someone.
2. The recipient received a delivery receipt from "private@gmail.com". Here's the delivery receipt he received:

Return-Path: <private@gmail.com>
Received: from bda073-cell00.bisx.prod.on.blackberry ( [])
by mx.google.com with ESMTPS id e18sm1096395qba.27.2008.
(version=SSLv3 cipher=RC4-MD5);
Wed, 09 Jan 2008 23:52:19 -0800 (PST)
Reply-To: private@gmail.com
X-Priority: Normal
From: private@gmail.com
To: "John Smith" <johnsmith@pacbell.net>
Date: Thu, 10 Jan 2008 07:51:52 +0000
Subject: Delivered: RE: century prep
Content-Type: multipart/report; boundary="part35671-boundary-1175672658-1340370967"
MIME-Version: 1.0

Content-Type: text/plain
Your message was delivered to the recipient.
Content-Type: message/delivery-status

from private@gmail.com
reply-to private@gmail.com,
to John Smith <johnsmith@pacbell.net>,
date Jan 9, 2008 11:51 PM
subject Delivered: RE: century prep
mailed-by gmail.com

Your message was delivered to the recipient.