A tester suspects an organization uses multiple mail servers. The tester wants to confirm the designated mail host by using DNS. Which approach is best for identifying that server?
Request the record that specifies the inbound mail handler
Attempt a record transfer to retrieve information from the remote host
Requesting the specialized record that indicates the inbound mail handler is the most effective. Scanning common ports might show servers that appear to run email services, but it does not confirm the official host for receiving mail. Sweeping the subnet can locate many active devices but does not isolate the designated mail server. Attempting a record transfer depends on a server misconfiguration and is unreliable for finding the official mail record.
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What is the specialized record used for identifying the inbound mail handler in DNS?
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How can you request an MX record using DNS queries?
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Why is querying an MX record more reliable than scanning ports for identifying mail servers?