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Logging Overview

Last updated March 2020

Momentum’s logging capabilities are implemented by various modules. They are intended to maintain auditing and a history of events, providing information such as system errors, message disposition, and engagement tracking. The logging subsystems range from transactional logs on a server node to replicated server node logs, aggregated on the designated log aggregator.

Log Files

The following are Momentum's logging modules. For additional information about use and configuration, follow each link :

  • adaptive - logs adaptive delivery events

  • as_logger - journals replicated audit series to disk at a configurable, periodic interval

  • bounce_logger - provides bounce data and bounce classification

  • chunk_logger - provides a safe interface for logging asynchronously from Lua, C, and C++

  • custom_logger - enables you to create custom logs defining your own logging fields and delimiters

  • ec_logger - provides message disposition status, tracking messages from generation through delivery

  • event_hydrant - provides message disposition status, including message generation, message reception, message delivery, and engagement tracking

  • exim_logger - supports logging in the same style as the Open Source MTA Exim (

  • fbl - records all abuse messages from feedback loop services offered by many ISPs

  • http_logger - logs HTTP requests and responses made by the httpsrv module

  • ilf_logger - provides an easy way to comply with the usage reporting requirements contained in the agreement with Message Systems

  • postfix_logger - supports logging in the same style as the Open Source MTA Postfix (

  • sendmail_logger - supports logging in the same style as the Open Source MTA Sendmail (

Momentum can generate logs in two formats:

  • text - entries vary based on the type of log. For the log formats, see Log Formats .

  • jlog - binary, consumable logs, intended to be consumed by an application. These logs will continue to be saved until a consumer reads them.

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