Before you begin | SMTP | POP3 | HTTP | NNTP
Exchange Server 5.0 includes support for the POP3 protocol, allowing you to use a standard POP3 client to retrieve mail from the server. To configure this at the Server, follow the following steps:
1. Bring up the Exchange Server Administrator program, go to the Protocols container for your site, and double click on the POP3 protocol object. Check the checkbox that says "Enable protocol." Go to the Authentication tab, and make sure that all four checkboxes are selected. Close the POP3 properties window. This enables individuals with mailboxes on the server to access them using the POP3 protocol and read their mail. You can use any POP3 client such as the Exchange client with the Internet Mail Service added, Eudora, or Pegasus.
2. To enable your users with POP3 access to send mail to Internet users you may need to add an entry in the Internet Mail service. Open up the Internet Mail Service window, and select the Routing tab. You should see "Reroute Incoming SMTP Mail" selected, and you should have an entry in the routing window showing your own email domain as <inbound>. If you do, you do not need to do anything. If you do not have this entry, click Add, type in your domain name, and select "Should be accepted as inbound." Click OK to close the various windows. Click OK to close the information screen about DNS.
3. To test the POP3 support, you can use your POP3 client, of course. To test it manually, again open up a Telnet window, enter the name of your Exchange Server, but user 110 for the TCP/IP port. You should see a line similar to the following: +OK Microsoft Exchange POP3 server version 5.0.1457.10 ready If you see this, it means that the Exchange Server is listening on port 110, and is ready to receive POP3 commands to download mail. Note that POP3 clients use SMTP to send mail, which is why the routing tab for POP3 mail is part of the Internet Mail Service object. Type Quit to close the Telnet session.