Recipe8.20.Configuring the IMAP4 Server for User Access


Recipe 8.20. Configuring the IMAP4 Server for User Access

Problem

You want your users to be able to use the Internet Message Access Protocol (IMAP) to receive mail from your Exchange server.

Solution

Using a graphical user interface

  1. Open the Exchange System Manager (Exchange System Manager.msc).

  2. In the left pane, expand the appropriate Administrative Groups container and expand the Servers container.

  3. Expand the target server, expand its Protocols object, and the IMAP4 object.

  4. Right-click Default IMAP4 Virtual Server and select Properties from the drop-down list.

  5. Select the General tab, and choose an IP address to bind the IMAP4 service to, or choose (All Unassigned). If you want to change the default port number used by this IMAP4 server, click the Advanced button and enter those ports. If desired, limit concurrent connections and time-out time in minutes.

  6. Select the Access tab to control access to this IMAP4 virtual server. By default, IMAP4 authentication is sent in clear text. Configure access by clicking the buttons on this tab.

    • Click Authentication to set the authentication method for this IMAP4 virtual server. If desired, require SSL/TLS encryption to prevent network sniffing of credentials and message content. You can select Basic or SASL authentication. If you choose SASL authentication, you can click Edit to specify different SASL authentication methods. The only SASL authentication method currently supported is NTLM, but, in the future, more might be added and configured here. Click OK to close the Authentication dialog box.

    • If you want to enable SSL for IMAP4 clients, click Certificate and step through the Web Server Certificate Wizard. Once the server is configured to use an SSL certificate, you can click Communication to require that all communications for this virtual server take place on SSL.

    • To control which clients are allowed to connect to the IMAP4 virtual server, click Connection. Within the Client Connection Access dialog box, you can allow or prohibit clients based upon IP address, subnet, or domain. If desired, enter allowable or prohibited computers in this dialog box, and press OK.

  7. Select the Message Format tab to specify what format the MIME encoding should be converted to. You may choose plain text, HTML, or both.

  8. Select the Calendaring tab, and choose an Outlook Web Access server-to-service meeting requests for IMAP4 users. When a meeting request is mailed to the client, it will contain a URL pointing to the OWA server you specify. If your OWA server requires SSL connections be used, select Use SSL connections.

  9. Click OK to close the Properties dialog box.

  10. Ensure that the Microsoft Exchange IMAP4 service is set to automatic startup and is running from the Services applet available in the Control Panel.

  11. Right-click the IMAP4 virtual server in Exchange System Manager and select Start from the context menu.

Discussion

IMAP4 allows messaging clients to retrieve their data from the server and download the data to the local client machine. IMAP4 works in both online and offline modes, is more of an interactive protocol than POP3, which does not support manipulation of mail on the server. While IMAP4 does not have nearly as much functionality as MAPI, in cases where MAPI cannot be used, IMAP4 is a reasonable solution for mail retrieval. By default, IMAP4 traffic occurs on port 143 for plain-text, and SSL traffic occurs on port 993. Your network should be configured to allow the appropriate traffic to traverse freely if you use IMAP4.

See Also

Recipe 8.19 for configuring POP3 access, Recipe 8.20 for controlling which users can use POP or IMAP, MS KB 823024 (How to Use Certificates with Virtual Servers in Exchange Server 2003), and MS KB 319574 (How to Use Certificates with Virtual Servers in Exchange Server 2000)



Exchange Server Cookbook
Exchange Server Cookbook: For Exchange Server 2003 and Exchange 2000 Server
ISBN: 0596007175
EAN: 2147483647
Year: 2006
Pages: 235

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