tuproxy is a RFC1939-compliant POP3 proxyserver.
It is developed to fill the gap of a freely available POP3 proxy for Windows, but it is easily ported to other systems.
FiPPS is a simple POP3 proxyserver for Windows which scans mail headers with regular expressions for spam/mailworms and deletes the mails without downloading them.
WinNT HTTPMail->POP3 service. HotPOP3 is a Windows NT service, written in C++, which acts as a proxy between an HTTPMail server (MSN Hotmail) and any POP3 email client.
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