DOKK / manpages / debian 10 / greylistd / greylist.1.en
greylist(1) Mail Administration greylist(1)

greylist - command line interface to greylistd(8)

greylist { -h | --help | help }
greylist operation ...

This program provides a command line interface to greylistd(8); please refer to that manual page for more information on the purpose and functionality of this program.

In the following discussion, data... typically refers to the following triplet of information:

<sending host's IP address> <sender@address> <recipient@address>

The following operations are available:

Add data to the corresponding list (white if unspecified). If the triplet of a future mail deliveriy (subject to timeouts) matches this data, the idea is that the message would be accepted, temporarily rejected, or permanently rejected, respectively.
Remove data from all lists. If the data exists in any list, the command returns an exit status of 0, otherwise -1. A message is printed on standard output indicating the action taken.
Check the current status of data, i.e. if a message delivery would succeed if its triplet matched this data. If a list is specified, the word "true" or "false" is printed, indicating whether the data was in the corresponding list; the exit status is also set accordingly. Otherwise, one of the words "white", "grey", and "black" is written on standard output, and the exit status is 0, 1, or 2, respectively.

NOTE: This operation is non-intrusive, and thus does not update any of the greylist data. So, for instance, if the data is currently in the "grey" list, but its minimum retry time (retryMin) has elapsed, the text "white" would be printed. However, unless an update takes place prior to the retryMax timeout, the data would still expire from the "grey" list.

Same, but also update the greylist data accordingly. So if data is currently greylisted, but the minimum retry time retryMin has elapsed since it was first seen, data is moved to the "white" list.

This operation would normally be used by mail transport agents (MTAs).

Print some statistics on greylist utilization and hits.
Print statistics on greylist and whitelist hits in a format that MRTG can use as an External Monitoring Script.
Print available (original/unhashed) data items from the corresponding list(s).

NOTE: Internally, greylistd(8) hashes the provided data into a single 32-bit value for efficiency. Prior to version 0.6, the original data was not retained; as of version 0.6, data is saved if the "savetriplets" setting in the [data] section of the configuration file is "true". Only data items (i.e. triplets) that have been seen while this setting were enabled can be listed.

Force greylist data to be immediately saved (synchronized) to the filesystem.

Data is also saved after any operation if a certain update interval (default is 300 seconds/5 minutes) has elapsed since the last save, and there are no pending requests to greylistd(8).

Save greylist data to files, then reload configuration and data.

Clear all items in the specified list(s), or all lists if none is specified.

If the whitelist is cleared, all new data trilplets will initially be in a "grey" state.

Use with caution!

Whitelists messages received from the IP address on behalf of <mailinglist@somewhere> to <subscriber@yourhost>.
Prints "true" or "false" on standard output, depending on whether mail received from the IP address on behalf of <mailinglist@somewhere> to <subscriber@yourhost> should be deferred or not, respectively. The data is neither recorded nor changed to a "white" state.

The UNIX domain socket providing the main interface to "greylistd".

This python script and manual page is written by Tor Slettnes, originally for Debian GNU/Linux.

Copyright © 2004-2005 Tor Slettnes.

This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 2 of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.

On a Debian GNU/Linux system, the full text of the GPL is available in /usr/share/common-licenses/GPL. It is also available at:

Greylisting daemon.
Utility to add/remove support for greylistd in Exim 4 configuration files.
0.8 Tor Slettnes