Shared Address Space / Email Domain - Email Duplicating

I have an ES (Exchange Server) implementation where the mail is hosted by a
major ISP. Some of the users have ES accounts, others do not, because they
are not in same geographical locaiton. So ES is setup as a Shared Address
Space as in MSKB Articles: 321721 and 319759. There are NO MX records for
my ES at the Internet level. My ISP is responsible for mail. I use GFI's
POP connector (don't throw anything at me please), to retrieve the mail for
the specific users local to my ES, leaving the mail for the external users at
the ISP for their individual retrieval. Mail originating from a user in ES
to internal or external users for my domain or mail for other domains seem
fine. The problem is that emails are duplicating, seems mostly from mail that
originates from users outside of ES (external users or other domains). For
example, using xyz.com as the shared address space domain. The following
users:
a@xxxxxxx - Internal ES User (with external ISP mailbox)
b@xxxxxxx - External xyz.com User (external ISP mailbox only, no ES
account)
c@xxxxxxx - External xyz.com User (external ISP mailbox only, no ES
account)

Mail from a@ to any user is fine.
Using someuser@xxxxxxxxxxx as an example:
Mail to all of the above users will duplicate in users b & c, but not a.
Mail to b and/or c only is fine.

Here is some information that is puzzling to me and may lead to the cause.
In the ES Message Tracking I can see the message from someuser@xxxxxxxxxxx
(for example) listed as being sent to all three recipients, when messages
sent to b & c, should have been delivered by my ISP and stopped and not seen
by ES.

Wait, wait, writing this, I realized what is happening. And I just verified
my theory, by creating an internal user only (named itest), no external
mailbox at ISP, so no entry in my GFI POP Connector, I then sent mail from
an outside account to all users above and itest. In ES I received email for
itest, but that shouldn't happen, but it does because the email was addressed
to multiple recipients which included a@... an internal recipient.
Retrieving the mail for that account, ES must parse all recipeints, which is
how I recieved email to itest. That helps explain when mail originating from
outside account, sent to recipients of both internal and external users, the
following happens:
ISP receives mail, deposits in all malboxes (a, b, c)
POP Connector retrieves mail for user a.
ES receives mail, deposits mail for user a in ES account.
ES also sees other recipients that are not in ES, forwards them to
Internet.
ISP receives mail, deposits to mailboxes for users b, c, this
duplicating messages to b, c.
(One other thing, seems like users b and c will get the same piece
of mail "n" times, onces at the initial ISP
reception and "n" times, corresponding to the number of internal
ES recipients).


It took me writing this to see what is happening. Now the question is how
do I handle it? Has anyone implemented a similar environment... shared email
domain, users with external mailboxes left for them to retrieve? Is this an
ES problem or GFI POP Connector problem? Seems like the only way to resolve
is to go back and let Outlook Send and Receive and just us ES for storage?

Any help or ideas would be greatly, greatly appreciated.

Thanks
LThibx

.

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