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pop3d(8)							     pop3d(8)


  pop3d	- POP3 server


  /usr/sbin/pop3d [-d] [-s] [-t	trace-file] [-T	timeout]


  -d  Sets the socket to debugging and turns on	debugging.  All	debugging
      information is saved using syslogd.

  -s  Turns on statistics logging using	syslogd(8). At the end of each pop3d
      session, the following information is logged: username, number of	mes-
      sages deleted, number of bytes deleted, number of	message	left on
      server, number of	bytes left on server.

  -t trace-file
      Turns on debugging and saves the trace information in trace-file using
      the fprintf(3) command.

  -T timeout
      When the server is waiting for a command to arrive from the client, it
      times out	after the specified number of seconds and terminates the ses-
      sion.  This avoids having	pop3d processes	hang forever waiting for com-
      mand input from clients which have terminated abnormally.	A small	value
      is acceptable for	small to medium	networks where the network delay is
      within a few seconds.  In	this case 15-30	seconds	is not unreasonable.
      Networks with large delays in sending packets (for example, SLIP links)
      may require a larger value.  In this case	300 seconds (5 minutes)	is
      not unreasonable.


  The pop3d server is an implementation	of the Post Office Protocol Version 3
  from Qualcomm, Incorporated. It provides remote users	with the ability to
  manage electronic mail on a UNIX system.


  The operating	system supports	the following types of authentication for the
  pop3d	server:	UNIX authentication using the /etc/passwd file,	Authenticated
  POP (APOP), and enhanced security using C2. The default is UNIX authentica-

  To enable APOP authentication	for a user, you	must add the user to the
  mailauth database. See mailauth(8) and the Network Administration: Services
  manual for more information.

  To use C2 secure authentication, you must configure your system to use C2
  security. See	secconfig(8) and the Security guide for	more information.


  The pop3d server uses	the syslog daemon to keep a record of its activities.
  Messages are logged in the /var/adm/syslog.dated/date/mail.log file.


  The pop3d program will log debugging information when	the -d parameter is
  specified after its invocation in the	inetd.conf file.  Care should be
  exercised in using this option since it generates considerable output	in
  the mail.log file.  Alternatively, the -t file-name option will place
  debugging information	into file file-name using fprintf instead of syslog.

  You can confirm that the POP server is running by opening a telnet session
  to port 110.	For example:

       % telnet	myhost 110
       Connected to myhost.berkeley.edu.
       Escape character	is '^]'.
       +OK UCB Pop server (version 1.6)	at myhost starting.
       +OK Pop server at myhost.berkeley.edu signing off.
       Connection closed by foreign host.


  The server implements	two extended commands:

    +  XTND XMIT

       Sends a mail message using /usr/sbin/sendmail.

    +  XTND XLIST header [num]

       Extracts	and returns the	specified header line for the specified	mes-
       sage number. If the num parameter is missing, the command returns the
       header line for all the messages	that are not currently marked for


  Note that this implementation	of Qualcomm's POP3 server does not support
  Server Mode, Kerberos	authentication,	or the bulletin	feature.


      mail files

      POP program invocation

      mail logging file


  Commands: inetd(8), mailauth(8), mailusradm(8), secconfig(8)

  Network Administration: Services