MeterMaid

MeterMaid is a facility that comprises a server, which maintains "tables" of data, and a client side (in particular, the MTA&#x27;s callouts to MeterMaid via mapping table MeterMaid routine callouts,    URLs  encoded into MTA configuration, and  (new in Messaging Server 7.2) Sieve " " tests or actions). The MeterMaid server maintains its data in-memory; this offers high performance, but note that it does imply that the MeterMaid data is not preserved across MeterMaid (or Messaging Server as a whole) restarts. As multiple processes can communicate with the MeterMaid server over protocol, MeterMaid permits across-process tracking of data. MeterMaid is thus particularly suited for configuring "throttle" effects.

MeterMaid requires configuration of itself -- the MeterMaid server, and some basics of MeterMaid client operation -- configured in Unified Configuration via MeterMaid options and MeterMaid client options, or in legacy configuration  via configutil parameters. Once MeterMaid&#x27;s own operation is established, then configuring the MTA on how to find/communicate with MeterMaid is configured via MeterMaid MTA options. And then any specific MeterMaid uses may be configured into the MTA via mapping table routine callouts,   URLs in appropriate MTA  configuration options, or use of  Sieve " " tests or  actions.

For a number of examples of MeterMaid use in the form of MTA mapping table callouts to MeterMaid routines, see the discussion of Triggering effects from transaction logging with LOG_ACTION.

To find all options potentially relevant to MeterMaid, try doing msconfig&#x3e; apropos metermaid Note that there are the options relevant for the MeterMaid server, settable under the   group, and there are options relevant for any MeterMaid clients, settable under    group; respectively, these correspond to the legacy configuration   and    configutil parameters. Some options are settable either generally for a named  or   group, or settable specifically for a named table under a   or   group. (Note that a named  group may only be set under  ;  a named   group may only be set under  .)

Then there are also a number of  MTA options that override,  for MTA purposes, some of the normal   or   options. There are also the   and   IMAP options (under the    group), to specify whether to use MeterMaid, and what MeterMaid table to use, for password expiration alerts.

See also the  options, as they are settable under.

See also:
 * MeterMaid MTA options
 * metermaid options
 * metermaid_client options
 * Mapping entry templates
 * MTA URL types
 * Sieve metermaid extension
 * check_metermaid callouts
 * Triggering effects from transaction logging with LOG_ACTION
 * Mail filtering and access control
 * Defending against denial of service attacks
 * viametermaid Option
 * metermaidtable Option
 * IMAP password expiration alert options