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Use Exim4 for E-Mails


Exim4 is a mail transfer agent (MTA) for Unix-like systems that connect to the internet. The Exim4 agent, that is included in the Paragon Insights software, sends network health reports and alert notifications (for network or device issues) to the e-mail account of the Exim4 host user. The Exim4 host is the Paragon Insights primary node.


In case of multinode Paragon Insights installation with more than one primary node, the Exim4 host is one of the primary nodes.

To enable Paragon Insights to use Exim4 MTA, you must do the following:

  • Configure the Exim4 hostname (the primary node hostname) in the file that has the environment variables of all microservices. This configuration ensures that Paragon Insights can reach the Exim4 host when an alert or a report is generated. If the Exim4 host is not reachable, Paragon Insights does not forward the e-mail to the Exim4 agent.

  • Configure your DNS server to resolve the Exim4 host's FQDN to the virtual IP address (VIP) of the Paragon Insights virtual IP address. The format of the FQDN is This configuration ensures that the Exim4 agent discovers the DNS mail server for the domain based on the Exim4 host's FQDN. The Exim4 agent then forwards the e-mail to this DNS mail server.