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This simply tells us if a particular DNS record was found, so could be useful to see if an entered hostname was valid within an email check.
checkdnsrr -- Check DNS records corresponding to a given Internet host name or IP address
Let us assume a couple of entries, the first being the valid smirkingloon.com, the second being the invalid liamdelahuntyy.com (extra y)
Notice the later domain fails and doesn't return a value