ExchSrvr sends and downloads same emails

Hello All

I have issue which is the following:

in a nutshell, i have a catch all address, which is downloaded via my SBS
POP3 connector, exchange distributes with no problems, however i have 5 users
outside of my sbs network, so when a email lands in the catch all it gets
filterd, if it is for those five users its get put into a seperate pop box
for them.
Internall i had enable forward emails with unresvolved host to: and use the
ISP mail server, to send mail to those 5 clients, but my problem lies when a
email is incorrectly addressed, it goes from :

Catch all POP3 -> Exchange Server -> Forward with Unresolved Email Recp ->
Send to ISP Mail server -> ISP mail server finds mail.xyz.com.au and delivers
the mail there -> email then does not meet filtering requirements -> mail
sits in pop3 catchall box and downloaded again -> cycle begins

Detailed info
Setup: My ISP has a catchall address for domain XYZ. In a POP3 Setup so
anything @XYZ falls into the catchall pop3 account. It has 5 exceptions, this
is for the users that are not part of the SBS Domain, so when a email comes
to them the catchall filters them out and delivers it to their own pop3
accounts. which they connect to and download.

My Exchange Server use's a POP3 connector which connects to the pop3 account
(lets call it ) and downloads the emails.
Exchange then distrubutes those emails successfully.

However, when a client on the LAN sends a email to a person who is not in
the Domain (the 5 exceptions) it fails, since it can not find that user
- which is correct because they are not listed in the AD.
So in the Connector in the Exchange SYSTEM MANAGER -
Server\Server\Protocols\SMTP\ virtual server, in the properties in MESSAGES,
i have enabled Forward all mail with unresolved recipients to host - and use
their ISP's DNS.

What happens is when a email comes into the catch all that is incorrectly
addressed, it uses the FORWARD fucntion, sends to the ISP, the ISP then
delivers it to my Catchall Address again, and SBS then downloads the email
again.
Which can cause major greif if thre is more than 1 person on that header
(TO, CC or BCC field)

Is there any way I can stop this from happening.

I have already setup on the SBS POP3 Conenctor to deliver failed mail to a
user account as well.

I have a major issue at the moment I do not how to fix this... is there any
way???

Regards Ash

 

You'd uncomplicate your life by moving to incoming mail via SMTP instead of
POP3.

 

Hello Steve

Yes I know i would, but unforunately this is for a client of mine, who are
very budget driven, I am doing this for free for them,

I am asking for help.