How do I configure Exchange and POPcon if I want to handle only part of a domain?

Q:

-----Original Message-----

Date: Mon, 27 Jun 2005 14:10:11 -0700 (PDT)
To: support@servolutions.com
Subject: Exchange configuration

Hi,

I've installed Windows SBS to a small office. They are part of a large company and they have a SBS server in their head office. Actually they have mail accounts in the ISP side. What they do is created the mail account in the exchange server and gets downloaded by the ISP side.

I went through your article how to config the exchange server. But my problem is the registered domain name. Head office is already using the registered domain name so it cannot be used in the branch office. And my requirement is to download the e-mails to the exchange server from the ISP. These mails accounts will only be the users in that office and rest of the other e-mail should not be downloaded. So how can I do this? In the head office they use an Exchange configuration setting to forward any undeliverable message to the ISP so then it'll send them to the proper persons that having the same e-mail alias and to the other e-mail address. Well I'm new to exchange stuff so if you find something unclear in this mail ply let me know so I can detail give info abt it.

A:

Hi,

here is what I think you should do if you are using individual POP3 mailboxes on your ISPs POP3 server:

1. Configure your exchange server (Exchange System Manger, Recipients, Recipient Policies, Properties of the default policy) to accept email for an internal domain name called branchoffice.local or something like that but different from your standard domain name (let's call that company.com). Do NOT add company.com here! This ensures that email to some user @company.com gets sent out to the internet. If you add a domain here, exchange will not send out the email to the internet because it already knows it is handling that domain itself.
2. Give every user in ActiveDirectory two SMTP email addresses: One in company.com (make that the default address) and one in branchoffice.local. Make sure the part before the "@" matches in the two addresses. This ensures that your Reply-To Addresses in emails that your users send out will be user@company.com while allowing POPcon to transfer emails to the user via the user@branchoffice.local name.
3. Configure POPcon to download email from the individual POP3 mailboxes and to always forward the mail from the account to the respective user@branchoffice.local.

If you can't use individual POP3 mailboxes on your ISPs POP3 server but need to use a catch-all type of mailbox you need to configure your system like this:

1. Just as above: Configure your exchange server (Exchange System Manger, Recipients, Recipient Policies, Properties of the default policy) to accept email for an internal domain name called branchoffice.local or something like that but different from your standard domain name (let's call that company.com). Do NOT add company.com here! This ensures that email to some user @company.com gets sent out to the internet. If you add a domain here, exchange will not send out the email to the internet because it already knows it is handling that domain itself.
2. Just as above: Give every user in ActiveDirectory two SMTP email addresses: One in company.com (make that the default address) and one in branchoffice.local. Make sure the part before the "@" matches in the two addresses. This ensures that your Reply-To Addresses in emails that your users send out will be user@company.com while allowing POPcon to transfer emails to the user via the user@branchoffice.local name.
3. Configure POPcon to download email from the catch-all style POP3 mailbox and add your internet domain name ("domain.com") to POPcon's list of accepted recipient domains on the POP3/IMAP page.
4. On the ADVANCED configuration page configure the "Auto replacement of recipient domains" feature by adding a replacement of "domain.com"->"branchoffice.local". This will cause POPcon to automatically replace every instance of "domain.com" in recipient addresses with "branchoffice.local".