Exchange and external mail server problem

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Hi

Not really sure how to explain it but I tried to google the answer and a solution with no joy. I've got SBS 2003 running in one of the branches with Exchange being responsible for pulling off emails from external mail server (POP3) and distributing them among the users (though MS Outlook). I've got 2 sales reps which work around the country and I've created 2 email accounts for them on the mail server which they can access using webmail service. Those 2 accounts are not being pulled off by exchange and sales reps have no access to the network nor AD accounts.

Now my problem is that they get emails from everywhere apart from the office that runs exchange. When an office worker sends an email to one of the sales reps he gets message back that mailbox can not be found (5.1.1 error). This obviously happens because exchange tries to match all email addresses in domain (company.co.uk for example) to local mailboxes, and because they don't have local mailboxes (neither we want them to have them), it throws back an 5.1.1 error saying that mailbox can't be found.

I know I could tell them to use their private accounts and create mailboxes on exchange server that would redirect emails to their private accounts. Is there a way to make exchange to work as it is but when the mailbox is not found pass the email on to the external server so the message actually gets there and sits there until it's deleted through webmail interface or downloaded and deleted (POP3, IMAP).

I hope it's clear what I'm trying to do, if not let me know and I will try to explain it further.

Any help would be appreciated

EDIT: I think I could also configure clients to use Exchange to download emails but send them directly to the mail server (SMTP), but that's not what I want

 

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Not sure how you would do what you want but why not just create the accounts in AD and pull the emails like everyone else, then give them access over OWA or exchange anywhere.

added
I just spotted thie bit

Is there a reason for this? CALs or something.

 

Why not just create an Exchange Mailbox and give them access via OWA or OMA?

 

Mainly because SBS sits in the middle of nowhere on BT broadband with not all that great upstream speed.
There are also 10MB+ attachments involved (CAD files) and I want to move as much traffic away from that SBS as I can.

 

Not getting what you mean, if you are using POP3, SMTP still has to upload the files mate.

 

Well no one is uploading anything manually but transfer still takes time.
Users involved are remote to SBS which means that when using OWA and trying to download file to their laptop/workstation they will be limited to SBS upload speed regardless of them being on 20Mbit connection.

 

I'm really not getting what you are trying to achieve.

Why does anything need to be done on SBS for these Remote Users?

Why do they have to use POP, why not SMTP?

You have already stated they have no requirement for access to Domain Resources so why not just create a mailbox at your main site on your Exchange Server?

They can then access this on OWA.

 

I see what you mean now.
This SBS is not part of our network. Company involved is our business partner and I only want to help them out, hence why I'd like to keep it between their Exchange server and their Web Hosting provider.
So the only OWA I would have available for them to use would be on SBS. I'd like to use ISP's web mail facility instead.

 

OK, what about the following:

- Create a Disabled Mailbox on your Exchange Server (note disabled)
- Create a Contact for the Remote Users in your Active Directory that is the email address of the POP account you want emails to be forwarded to.
- Forward all emails from the Disabled Mailbox to the Contact

In doing this the Remote Users could have a fake email address in your organisation that really is just an email relay and the physical account is disabled.

Does that work?

 

That's exacly what it was Sparky. Thanks a lot for that. Rep given.

2 parts of the article you've linked applied to me:
"SMTP Domains that are shared between your Exchange Organization and another SMTP System"
"Message Flow"

I followed the steps described there and it works now. Thanks again Sparky.
Also thanks craigie for trying to help, much appreciated