MX lookup
Find the mail servers for a domain and see whether it publishes usable MX records.
DNS · MX records · RFC 7505
Enter a domain to find its mail servers.
What an MX record tells you
Mail exchange records tell senders which servers accept email for a domain. This lookup orders the published hosts by their DNS priority and detects a null MX record.
A positive result does not prove that a mailbox exists, that a message will arrive, or that the sender has a good reputation. It only confirms that the domain publishes usable MX records.
A single null MX record means the domain does not accept email. The behavior is defined in RFC 7505.
Use the result before review
Domain checks can catch a mechanical problem while an applicant is still in the intake. Klarefi can combine that result with the submitted documents, cited facts, and required follow-up.