How do I speed up Dovecot Authentication with Caching?

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Release Found: Red Hat Enterprise Linux 5 running Dovecot 1.0 or later.

Purpose

When deploying Dovecot as a POP or IMAP server in support of a large number of users, performance may become a issue. Using authentication cache is one option available for improving performance.

Assumptions

Red Hat Enterprise Linux 5 is installed.

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