Fetchmail handles POP or IMAP servers (and SMTP ETRN). It's simple to configure for multiple accounts, can deliver mail to different mailboxes, etc. Very flexible and powerful.
What's the point? It's centralization: one place where you maintain all the accounts, one program that goes out and gets the mail. It can isolate users from needing internet access, or allow you to add more filtering to messages.
From the FAQ
Fetchmail is a one-stop solution to the remote mail retrieval problem for Unix machines, quite useful to anyone with an intermittent PPP or SLIP connection to a remote mailserver. It can collect mail using any variant of POP or IMAP and forwards via port 25 to the local SMTP listener, enabling all the normal forwarding/filtering/aliasing mechanisms that would apply to local mail or mail arriving via a full-time TCP/IP connection.
Fetchmail is not a toy or a coder's learning exercise, but an industrial-strength tool capable of transparently handling every retrieval demand from those of a simple single-user ISP connection up to mail retrieval and rerouting for an entire client domain. Fetchmail is easy to configure, unobtrusive in operation, powerful, feature-rich, and well documented.
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