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Man Pages


Manual Reference Pages  -  PROXSMTPD.CONF (5)

NAME

proxsmtpd.conf - the configuration file for proxsmtpd(8)

CONTENTS

Description
Settings
Addresses
See Also
Author

DESCRIPTION

proxsmtpd(8) reads a configuration file when starting up. The location of the file is dependent on how you compiled proxsmtp but it should usually be in either the /usr/local/etc/ or /etc/ directories. If proxsmtpd(8) does not find its configuration file it’ll print a warning when it starts up along with the location it’s expecting to find it in. You can also specify a different location for a config file by passing the -f argument to proxsmtpd(8)

The settings are specified one per line. The setting names come first, followed by a colon and then the value. Comments start with the ’#’ character on a line of their own. Whitespace is ignored at the beginning of line, end of line and around the colons.

A sample configuration file can be found in the doc/ directory of the proxsmtp distribution.

SETTINGS

The various settings are as follows:
FilterCommand
  This is the command used to filter email through. If not specified then no filtering will be done. Specify all the arguments the command needs as you would on a command-line.

[ Default: no filtering ]

FilterTimeout
  The amount of time in seconds to wait for the FilterCommand to process email data.

[ Default: 30 seconds ]

FilterReject
  The rejection message used when FilterType is set to ’reject’.

[ Default: 530 Email Rejected ]

FilterType
  When set to ’pipe’ the email data is piped through the FilterCommand using standard in and standard out. When set to ’file’ the email data is saved to a file and the file name is passed to the FilterCommand using the EMAIL environment variable.

When set to ’reject’ then email is immediately rejected using message defined by the FilterReject option.

[ Default: pipe ]

Header
  A header to add to scanned messages. Put an empty value to suppress adding a header. You can include the following special formatting characters in the string to include special values:
%i Client IP Address
%l Local IP Address
%d Current Date

You can also include the standard \r or \n escapes.

[ Optional ]
KeepAlives On slow connections the server will sometimes timeout before proxsmtpd(8) is finished filtering the file. This option sends NOOP’s to the server to keep the connection alive. Specify the number of seconds, or 0 to disable.

[ Default: 0 ]

Listen The address and port to listen for SMTP connections on. See syntax of addresses below.

[ Default: port 10025 on all local IP addresses ]

MaxConnections Specifies the maximum number of connections to accept at once.

[ Default: 64 ]

OutAddress The address of the SMTP server to send email to once it’s been scanned. See syntax of addreses below.

[ Required ]

Skip Whether to skip certain kinds of connections or email from running through the filter. Specify ’authenticated’ to skip SMTP authenticated connections.

[ Optional ]

TempDirectory The directory to write temp files to.

[ Default: /tmp ]

TimeOut The number of seconds to wait while reading data from network connections.

[ Default: 180 seconds ]

TransparentProxy Setting this option to ’client’ enables transparent proxy support, which allows you to route all SMTP traffic that’s going through a gateway through proxsmtp which will then send it on to its final destination. This setup usually involves firewall rules which redirect traffic to proxsmtp, and the setup varies from OS to OS.

Specify ’full’ to enable a true transparent proxy where neither the client or server are aware of the proxy by way of the packet headers. This setup usually involves routers to redirect traffic to proxsmtp, and the setup varies from OS to OS.

[ Default: off ]

User The user to run as. If this option is specified then proxsmtpd(8) must be started as root. It will then drop root privileges and run as the specified user. The user can either be a name or a numerical user id.

[ Optional ]

XClient Send an XCLIENT command to the receiving server. This is useful for forwarding client addresses and connection info to servers that support this feature.

[ Default: off ]

ADDRESSES

Addresses can be specified in multiple formats:
  • Unix local addresses can be specified by specifying their full path. (ie: ’/var/run/socket’).
  • IP addresses can be specified using dotted notation with a colon before the port number (ie: ’127.0.0.1:3310’).
  • IPv6 addresses are implemented but disabled. The code needs testing.

SEE ALSO

proxsmtpd(8)

AUTHOR


.An Stef Walter Aq stef@memberwebs.com
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