GSP
Quick Navigator

Search Site

Unix VPS
A - Starter
B - Basic
C - Preferred
D - Commercial
MPS - Dedicated
Previous VPSs
* Sign Up! *

Support
Contact Us
Online Help
Handbooks
Domain Status
Man Pages

FAQ
Virtual Servers
Pricing
Billing
Technical

Network
Facilities
Connectivity
Topology Map

Miscellaneous
Server Agreement
Year 2038
Credits
 

USA Flag

 

 

Man Pages


Manual Reference Pages  -  GREYFIX (8)

NAME

greyfix - A greylisting policy daemon for Postfix

CONTENTS

Synopsis
Description
Usage
Notes
     Logs
Also See
Authors

SYNOPSIS

greyfix [-Vvd] [-h home_directory] [-g delay_period] [-b bloc_idle_period] [-p pass_period] [-r reject_action] [-G greylist_action] [-/ prefix_size] [-6 prefix_size] [--dump-triplets] [--help]

DESCRIPTION

greyfix is a efficient greylisting policy daemon for Postfix.

The options are:
-V -, --version
  Show version information.
-v -, --verbose
  Verbose logging.
-d -, --debug
  Debug logging.
--help
  Show usage information.
--dump-triplets
  Dump the triplets database to stdout. Mostly for debugging purposes.
-b seconds,--bloc-max-idle seconds
  How many seconds of life are given to a record that is created from a new mail ( ip, from, to) triplet. Note that the window created by this setting for passing mails is reduced by the amount set for --greylist-delay . Also see --pass-max-idle . Defaults to 18000.
-g seconds,--greylist-delay seconds
  How many seconds we will block inbound mail that is from a previously unknown ( ip, from, to) triplet. If it is set to zero, incoming mail association will be learned, but no deliveries will be tempfailed. Use a setting of zero with caution, as it will learn spammers as well as legitimate senders. Defaults to 3480.
-h home_directory,--home home_directory
  Location of the Berkeley DB environment home location. Defaults to /var/db/greyfix.
-p seconds,--pass-max-idle seconds
  How long to give to a record we are updating from an allowed (passed) email.

The default is 3110400, which should be enough to handle messages that may only be sent once a month, or on things like the first monday of the month (which sometimes means 5 weeks). Plus, we add a day for a delivery buffer.

-r action,--reject-action action
  The reject action directive that will be used. See access(5) for valid actions. The placeholder %d expand to the number of seconds, %p to the empty string if %d expands to 1 or "s" otherwise, %s to a single space, and %% to "%".

The default is "DEFER_IF_PERMIT Greylisted by greyfix 0.4.0, try again in %d second%p. See http://www.kim-minh.com/pub/greyfix/ for more information."

-G action,--greylisted-action action
  The action that will be used the first time a triplet passes greylisting. Same expansion as for --reject-action .

The default is "PREPEND X-Greyfix: Greylisted by greyfix 0.4.0 for %d second%p. See http://www.kim-minh.com/pub/greyfix/ for more information."

-/ prefix_size,--network-prefix prefix_size
  Only consider the first prefix_size bits of an IPv4 address. Defaults to 32, i.e., the whole address is significant.
-6 prefix_size,--network6-prefix prefix_size
  Only consider the first prefix_size bits of an IPv6 address. Defaults to 128, i.e., the whole address is significant.

USAGE

Edit Postfix’s master configuration file, /usr/local/etc/postfix/master.cf, and add the following:
greyfix    unix  -       n       n       -       -       spawn
  user=nobody argv=/usr/local/sbin/greyfix -/ 24 -6 56

Edit Postfix’s main configuration file, /etc/postfix/main.cf, and add the following:

smtpd_recipient_restrictions =
  permit_mynetworks,
  reject_unauth_destination,
  check_policy_service unix:private/greyfix

If there is already an smtpd_recipient_restrictions configuration line, you should edit it rather than add a new one. The important part for Greyfix is that you should add check_policy_service unix:private/greyfix to it. Finally, have Postfix reload its configuration with postfix reload.

NOTES

    Logs

Greyfix logs to syslog(3) with the LOG_MAIL facility. As such, the log messages should appear along Postfix’s.

ALSO SEE

access(5)

AUTHORS

greyfix was written by
.An Kim Minh Kaplan <http://www.kim-minh.com/>.
Search for    or go to Top of page |  Section 8 |  Main Index


Powered by GSP Visit the GSP FreeBSD Man Page Interface.
Output converted with manServer 1.07.