4.6. POP Tuning Specifics
At this point, we’ll cover some specifics for providing high-performance POP service. The POP protocol is defined in RFC 1939 [MR96]. Even though it is possible to configure most POP clients to leave copies of all messages on the email server, a POP server is intended to act as a temporary repository for email that will be periodically downloaded to another machine. While not all users will operate along this model, in most environments a majority of them will.
Although we restrict our field of interest here to Open Source email solutions, the email administrator can choose from many packages. These POP daemons differ in their feature sets, such as whether they support APOP, POP over Transport Layer Security (TLS) [ ...
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