Who does not know the problem: You want to send an urgent e-mail, but the target server refuses to receive the message. To investigate the cause, mail admins have to go through the logs and determine the reason for the rejection. The more mail servers an admin has under his wing, the more confusing and complex the whole thing gets.

Lightmeter recommends how you can remove the blacklist entry of your mail server.

(Image: Lightmeter)

As a remedy for this, the beginning 2019 Sam Tuke presented his project Lightmeter, a monitoring tool for Postfix Servers – after all, around a third of the market. It collects information and uses it to create statistics on the dispatch of e-mails, which it presents graphically in a dashboard. Now the project has released version 1.0, the biggest innovation of which is the ability to handle blacklisting entries, which was promised in January.

Recommendations for action included Lightmeter analyzes the logs of the Postfix mail server – including automatic import of historical logs -, extracts integrity metrics from them and visualizes them in real time. In the event of problems with the mail server, the monitoring tool generates notifications on the web and optionally via Slack. If one of the mail servers has landed on a real-time blackhole list (RBL), it determines recommendations on how to remove this entry.

Lightmeter had in June via the nlnet Foundation 50. 000 Euro received from the Next Generation Internet project of the EU Commission. The grant is intended to support Lightmeter in its efforts to maintain the independence of decentralized, digital communication from the large technology oligopolies. Lightmeter 1.0.0 is available as a Docker image and in GitLab or Bintray. The software is licensed under Affero GPL Version 3 (AGPLv3).

(avr)