popper (8) - Linux Manuals

popper: POP3 server

Command to display popper manual in Linux: $ man 8 popper

popper - POP3 server

[-k ] [-a plaintext | otp | sasl ] [-t file ] [-T seconds ] [-d ] [-i ] [-p port ] [--address-log= file ]

serves mail via the Post Office Protocol. Supported options include:

-a plaintext | otp | sasl: Tells which authentication mode is acceptable, sasl enables SASL (RFC2222), and otp enables OTP (RFC1938) authentication. Both disable plaintext passwords.
--address-log= file: Logs the addresses (along with a timestamp) of all clients to the specified file. This can be used to implement POP-before-SMTP authentication.
-d: Enables more verbose log messages.
-i: When not started by inetd, this flag tells that it has to create a socket by itself.
-k: Tells to use Kerberos for authentication. This is the traditional way of doing Kerberos authentication, and is normally done on a separate port (as it doesn't follow RFC1939), and should be used instead of using SASL.
-p port: Port to listen to, in combination with -i
-t file: Trace all commands to file.
-T seconds: Set timeout to something other than the default of 120 seconds.

RFC1939 (Post Office Protocol - Version 3)

The server was initially developed at the University of California, Berkeley.

Many changes have been made as part of the KTH Kerberos distributions.