well, The Mail Storage Access API is the common interface to the mail store for all processes. The POP3 service, the SMTP delivery service for POP3, and the POP3 Server Administrator use the API to access the mail store.
The mail store uses the file system for storage. The mail store is typically located on the same server as the POP3 service, but it should be located on a different local or network volume than the operating system to avoid potential disk space problems. For large mail stores, the mail store can be placed on a Network Attached Storage (NAS) device and accessed by one or more servers running the POP3 service. Even though the mail store is contained in the file system, it is accessed by using the Mail Storage Access API.
The SMTP delivery service for POP3 is the component that transfers e-mail from the SMTP service to the user mailboxes. The delivery service is notified by the SMTP service when new e-mail arrives. New e-mail is delivered to the mail store by means of the Mail Storage Access API.
The POP3 Server Administrator is the interface used by the tools to configure the server, domains, and mailboxes. The server administrator accesses the mail store by means of the Mail Storage Access API to create or modify domains and mailboxes. Modifications to the service itself are made through calls to the administration interface within the POP3 service.
Answered by Romi
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11:33 AM on July 03, 2008