Check manual page of check_smtp

SMTP Connection
Distribution	Official part of Checkmk
License	GPLv2
Supported Agents	Active

This is an active check that connects to a SMTP server and checks if the SMTP protocol works. STARTTLS can be used to establish a SSL encrypted connection. Using SMTP AUTH is possible.

You can specify a string to expect in the respose of the server. You can give specific SMTP commands to execute on the connection and define which responses are expected. Thresholds for the response time can be configured for WARN and CRIT.

If using SSL you can configure to check for expiration of the SSL certificate within the next days.

This check can be configured by Wato.

Item

The name of the host