Fluentd - Fluentd is a cross platform open source data collection solution originally developed at Treasure Data.
SpamAssassin - Use this program to "Unspam" your mailbox(es).
Splunk - Splunk's operational intelligence platform helps unearth intelligent insights from machine data.
MailScanner - MailScanner is a open source email security system design for Linux-based email gateways.
Datadog - See metrics from all of your apps, tools & services in one place with Datadog's cloud monitoring as a service solution. Try it for free.
Rspamd - Rspamd is an advanced spam filtering system that allows evaluation of messages by a number of rules...