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Mail delivery to and from Exchange Server 2003


We have a plain old POP3 Mail Server (Type InstaGate EX2) sitting on our gateway in a black box which is also a firewall. Within this box, I have the option to "forward all incoming mail to an internal SMTP server". Since I have an Exchange 2003 server sitting on my LAN doing mainly groupware stuff, I would like to do just that. However, I am not sure how to go about doing this on the Exchange Server.

Basically I want to accomplish 2 things:

1) Configure my Exchange 2003 Server to act as an SMTP server and recieve Mail from the blackbox on my gateway
2) Have the Exchange Server send Email directly to the internet (currently, the blackbox is handling the recieving (POP3) and sending (SMTP) of all mail traffic going to the internet)

On the client side in Outlook, the users currently have 2 services activated:

1) POP3/SMTP to communicate with the blackbox for mails going to/from the internet
2) Exchange Server to handle LAN-internal mail and groupware stuff

Ideally, after pulling this through, I would like to end up with the Exchange Server Service in Outlook only.

Can this be done? It would be great if someone could tell me what to do on the Exchange Server since I don't know it very well.

Thanks and regards

1 Solution
1) ONe thing you need to be aware of is to add the SMTP address for your Internet Mail domain for each user.  By default any user that has an Exchange mailbox will have an internal SMTP address (bob@company-int.local for example), but you will need to add the Internet SMTP address for each user (bob@company.com for example).  This will allow him to receive internet e-mail.

This change can be done locally on each user account or gloabally through Exchange admin for the entire organization.

2) Once each user has the proper SMTP mail address, you can program your black box to forward mail to your Exchange server.  You will have to open TCP Port 25 to your Interal Exchange mail server.  This way the black box can send the mail to you exchange server.

At this point, you will have your end users with two mail connections in thier outlook profile (one for POP and the other for Exchange mail box mail)

In the future, you may want to change your MX record on the internet to point to your Exchange servers public IP address.  Once you do this, all mail will be Exchange mail and you can eventually remove the Pop3 from the Outlook profiles.

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