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3proxy 0.8
January 2016


Tiny but very powerful proxy


pop3p - POP3 proxy gateway service


pop3p [-d] [-l[[@]logfile]] [-pport] [-iinternal_ip] [-eexternal_ip] [-hdefault_ip[:port]]


pop3p is POP3 gateway service to allow internal users to access external POP3 servers.


-I Inetd mode. Standalone service only.
-d Daemonise. Detach service from console and run in the background.
-t Be silenT. Do not log start/stop/accept error records.
-u Never look for username authentication.
-e External address. IP address of interface proxy should initiate connections from. By default system will deside which address to use in accordance with routing table.
-i Internal address. IP address proxy accepts connections to. By default connection to any interface is accepted. It's usually unsafe.
-p Port. Port proxy listens for incoming connections. Default is 110.
-h Default destination. It’s used if targed address is not specified by user.
-l Log. By default logging is to stdout. If logfile is specified logging is to file. Under Unix, if '@' preceeds logfile, syslog is used for logging.
-S Increase or decrease stack size. You may want to try something like -S8192 if you experience 3proxy crashes.


You can use any MUA (Mail User Agent) with POP3 support. Set client to use internal_ip and port as a POP3 server. Address of real POP3 server must be configured as a part of POP3 username. Format for username is username@server, where server is address of POP3 server and username is user's login on this POP3 server. Login itself may contain '@' sign. Only cleartext authentication is supported, because challenge-response authentication (APOP, CRAM-MD5, etc) requires challenge from server before we know which server to connect.


Report all bugs to


3proxy is designed by Vladimir 3APA3A Dubrovin ()


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