Qpopper is a widely used server for the POP3 protocol. It includes TLS/SSL support, very fast start-up times, and reduced I/O at session close. This server is fully compliant with RFCs 1939 and 2449, and supports Kerberos V4, if enabled.
Qpopper is the most widely-used server for the POP3 protocol . Qpopper supports the latest standards, and includes a large number of optional features.