courierpop3d(8) [centos man page]

COURIERPOP3D(8) 					      Double Precision, Inc.						   COURIERPOP3D(8)

NAME

       courierpop3d - The Courier POP3 server

SYNOPSIS

       /usr/sbin/couriertcpd {-nodnslookup} {-stderr=syslog} {110} {/usr/lib/courier/courier/courierpop3login} [modules...]
			     {/usr/lib/courier/courier/courierpop3d} {./Maildir}

DESCRIPTION

       This is a simple POP3 server for Maildirs.

	   Note
	   The couriertcpd, courierpop3login, and courierpop3d modules may be installed elsewhere than indicated here.

       courierpop3login is usually started by couriertcpd. It already expects that a POP3 client is connected to standard input and output,
       presumably via a network socket.  courierpop3login reads the POP3 userid and password, then runs the authentication modules. The remaining
       arguments are passed along as arguments to modules.

       modules is one or more authentication modules (see the authlib(7)[1] manual page).

       Each authentication modules runs the program specified by its first argument, allowing the authentication modules to be chained. The last
       program in the chain is courierpop3d , which provides the actual POP3 service. In accordance with the authentication protocol, as described
       in authlib(7)[1] courierpop3d reads file descriptor 3 to see if the userid/password has been succesfully validated. If not, courierpop3d
       terminates.

       Otherwise, courierpop3d expects to be already running under the appropriate user and group id, with its current directory set to the
       account's home directory.

       The first order of business is to find the account's Maildir. If the environment variable MAILDIR is set, that's where we go. That should
       be the pathname to the account's Maildir. The environment variable MAILDIR may be set by the authentication module. If MAILDIR is not set,
       courierpop3d uses its first argument. Usually, the default maildir is $HOME/Maildir, therefore the first argument to courierpop3d is
       "./Maildir".

SEE ALSO

       authlib(7)[1], userdb(8)[2].

AUTHOR

       Sam Varshavchik
	   Author

NOTES

	1. authlib(7)
	   [set $man.base.url.for.relative.links]/authlib.html

	2. userdb(8)
	   [set $man.base.url.for.relative.links]/userdb.html

Courier Mail Server						    04/04/2011							   COURIERPOP3D(8)

MAKESMTPACCESS, MAKE(8) 				      Double Precision, Inc.					   MAKESMTPACCESS, MAKE(8)

NAME

       makesmtpaccess - Build ESMTP server access file

SYNOPSIS

       makesmtpaccess

       makesmtpaccess-msa

DESCRIPTION

       makesmtpaccess rebuilds the contents of the /etc/courier/smtpaccess.dat database from the contents of the files in the
       /etc/courier/smtpaccess directory. When the esmtpd script starts couriertcpd, the script specifies /etc/courier/smtpaccess.dat file to
       control access to the Courier mail server's ESMTP daemon. The makesmtpaccess script must be run before any changes in the
       /etc/courier/smtpaccess directory take effect.

       The couriertcpd(8)[1] manual page describes the general format of the access file.

       The default Courier mail server configuration uses the same access file, /etc/courier/smtpaccess.dat for both the regular ESMTP server, and
       the message submission server on port 587 (RFC 2476[2]). It is possible to use different access files. To do so, create a different access
       file, edit /etc/courier/esmtpd-msa, and set ACCESSFILE to the filename of the access file directory (the directory containing the plain
       text files, not the .dat file). Then, use makesmtpaccess-msa instead of makesmtpaccess to build the .dat file.

   The smtpaccess configuration file
       The couriertcpd(8)[1] manual page describes the generic format of the access file. The access file specifies what should be done with
       connections from defined IP address ranges. The basic choices are to accept or reject the connection. Also, the generic format of the
       access file allows arbitrary environment variables to be set based on the connection's remote IP address.

       The Courier mail server's ESMTPD server understands the following environment variables, which may be set in the access file:

       BLOCK
	   If this variable is set to a non-empty value, all mail will be rejected for this connection. The contents of the environment variable
	   will be used as the error message. This is not the same as the couriertcpd access file setting that immediately drops the connection.
	   The incoming connection is accepted, but every message will be rejected.

       FAXRELAYCLIENT
	   Allow the client to send faxes via the courierfax(8)[3] module.

	       Note
	       When ESMTP authentication is enabled, a successful authentication automatically sets FAXRELAYCLIENT.

       RELAYCLIENT
	   Allow the client to relay mail.

	       Note
	       When ESMTP authentication is enabled, a successful authentication automatically sets RELAYCLIENT.

       The following options are typically set globally in the esmtpd configuration file, but may be overriden in the smtpaccess configuration
       file:

       BOFHCHECKDNS
	   Do not check the return address's domain in DNS if this environment variable is set to 0. The default value of BOFHCHECKDNS is 1.

	       Note
	       Turning off the DNS check disables a number of options in the bofh configuration file. See courier(8)[4] for more information.

       BOFHCHECKHELO
	   Set this variable to 1 to check the hostname argument to the ESMTP HELO/EHLO command, as follows:

	   o   A hostname that's actually an IP address, and is the same as the connecting ESMTP client's IP address, is valid.

	   o   Otherwise hostname should be a valid DNS name with MX and/or A records, with at least one record matching the connecting ESMTP
	       client's IP address.

	   o   An ESMTP client with relaying privileges (either due to RELAYCLIENT explicitly set, or if it succesfully authenticates) may use
	       anything for an EHLO/HELO. The EHLO/HELO argument coming from an authenticated/relaying client is not checked.

       BOFHNOEXPN
	   Disable the EXPN command if this environment variable is set to 1.

       BOFHNOVRFY
	   Disable the VRFY command if this environment variable is set to 1.

       Other useful environment variables are listed in the submit(8)[5] manual page.

SEE ALSO

       esmtpd(8)[6], couriertcpd(8)[1], submit(8)[5].

AUTHOR

       Sam Varshavchik
	   Author

NOTES

	1. couriertcpd(8)
	   [set $man.base.url.for.relative.links]/couriertcpd.html

	2. RFC 2476
	   http://www.rfc-editor.org/rfc/rfc2476.txt

	3. courierfax(8)
	   [set $man.base.url.for.relative.links]/courierfax.html

	4. courier(8)
	   [set $man.base.url.for.relative.links]/courier.html

	5. submit(8)
	   [set $man.base.url.for.relative.links]/submit.html

	6. esmtpd(8)
	   [set $man.base.url.for.relative.links]/esmtpd.html

Courier Mail Server						    08/30/2011						   MAKESMTPACCESS, MAKE(8)