首先假设一下条件：
Your Proxy server for pop/imap is running on 192.168.1.1
You have 2 backend pop/imap servers: 192.168.1.22 and 192.168.1.33
You have a webserver that you will use for the authentication and redirection logic 192.168.1.44.
The authentication script is /mail/auth.php
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