What protocols does your mail server provide and on which TCP ports? For example:
For each protocol, there is a monitor in OpenNMS which is configured in "Pollerd" and his configuration file poller-configuration.xml. The configuration for monitors you can find here: http://docs.opennms.org/opennms/releases/20.0.0/guide-admin/guide-admin.html#ga-service-monitors
If you need a little bit more conceptional information how service monitoring works, have a look at http://docs.opennms.org/opennms/releases/20.0.0/guide-user/#gu-service-assurance.
Hope this helps.
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