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qmail includes a POP3 server with these features:
RFC compliant. Complies with RFC 1939 (POP3).
UIDL support. qmail-pop3d implements the optional UIDL command, which lists the unique ID of one or more messages.
TOP support. qmail-pop3d implements the optional TOP command, which returns the header and beginning of a specified message.
Modular password checking. The checkpassword package, available separately, implements password validation. Versions supporting different authentication methods and user databases are available.
Authenticated Post Office Protocol (APOP) hook. APOP is available using an alternative checkpassword module.
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