Duplicate email deliveries Exchange Server SBS 2003

PROBLEM: A user receives multiple copies of one email.
Additional Info: Only affects external emails received via the POP connector
The more addresses in the cc: - the more duplicate copies are received by a user

1. The ISP mailbag seems OK
2. Distribution groups dont seem to be the problem

We have SBS-2003.
Email collection via the SBS POP connector to a  Global POP box.
We have applied all the  exchange patches, and POP box patches

Any suggestions appreciated !

Who is Participating?
Jeffrey Kane - TechSoEasyConnect With a Mentor Principal ConsultantCommented:
This has to do with the way your POP3 HOST handles the email messages.  (the ISP).

What happens is that the POP3 host will create a separate message for each person in the cc field without fully modifying the headers.  Then, Exchange downloads these messages and re-reads the headers to make it's own copies of messages for each cc.  Details are here:

There's no real way to avoid this unless you have the sender use a distribution list address such as group@yourcompany.com.  You would then have to create the Distribution Group in your Server Management Console.

Alternatively, why not switch to SMTP mail?  The POP3 connector is really designed to just be a transition tool to allow you time to switch to SMTP email anyhow.  You can read more about how to do that here:  http://sbsurl.com/pop2smtp

davesneilsonAuthor Commented:
Thanks Jeff - great, but if the server goes off-line for any reason  (they have a single SBS box) what would happen to the mail ?
If an SMTP server goes offline, then email just queues at the sending server. Most servers will continue to attempt delivery for 48 hours. You should be able to make alternative arrangements for email in that sort of window.

Jeffrey Kane - TechSoEasyPrincipal ConsultantCommented:
If the server goes off line, it'll stop outbound mail of any type in most cases because DNS is handled exclusively by SBS.  So this is not an issue when deciding between SMTP or POP3.

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