title: Mail domain health: domain-based blacklists
agents: mail_domain_health
catalog: app/mail_domain_health
license: GPLv2
distribution:
description:
 This check queries domain-reputation blacklists (DBL/SURBL/URIBL) for a
 domain, collected by the {mail_domain_health} special agent via DNS. This detects a
 domain's reputation being damaged independently of any mail server IP address.

 The number of listings is measured against configurable levels (default {WARN}
 at one, {CRIT} at two), and every queried list is shown individually in the
 service details. Queries refused or blocked by a list operator are
 distinguished from genuine "not listed" answers.

 All thresholds and states are configurable via the rule "Mail security:
 domain-based blacklists".

item:
 The domain name.

discovery:
 One service is created for each configured domain when the feature is enabled.
