The POP server does not necessarily need
to be a Microsoft server, such as Exchange, but can be run on any POP3-compliant
messaging system.
CAUTION
Enable POP support in a messaging environment only if there is no other viable option.
POP3 support is less secure than other access methods, and can cause mail delivery
and security issues. For example, many POP clients are configured to pull all the mail
off the POP server, making it difficult to do disaster recovery of mail data.
Enabling POP3 Access on an Exchange Server If no existing POP3 server is available, but
support for the protocol needs to be enabled, the service can be enabled on an internal
Exchange Server 2003 system via the following procedure:
1. On the Exchange server, open the Services MMC Console (Start, All Programs,
Administrative Tools, Services).
2. Right-click the Microsoft Exchange POP3 service and choose Properties.
3. Change the Startup Type to Automatic, as shown in Figure 13.21.
4. Click Start to start the service and click OK.
Enabling SSL Support on the POP Virtual Server Realistically, all POP traffic across an
untrusted network such as the Internet should be encrypted as well, using Secure Sockets
Layer.
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