Exchange 2007 POP3 Connector

If you want your internal users to receive email from others outside the LAN, there are 2 possible ways to do so.

1) Make a MX record on Internet dns servers that points to your mail server's public IP.

2) Let 3rd Party companies host your mail server. The problem is that in such a way you must have a POP3 account for each user. To solve this problem you can make a catch all account which receives all emails. Then your exchange server must connect to the hosting server and receive emails, after that your exchange server will decide the receiver and forward it to that mailbox. unfortunately exchange does not not support this so you must use some 3rd party software. You can find some of them here http://www.slipstick.com/exs/popconnect.asp

NOTE: A Catch-all for email, usually refers to a mailbox on a domain that will "catch all" of the emails addressed to the domain that do not exist in the mail server. Configuring a catch-all address can help avoid losing emails due to misspelling.