MX records (mail servers)

The MX records that name the servers taking mail for this domain. None at all means the domain does not receive mail — which is a decision, not a fault.

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MX (mail exchanger) records tell the rest of the internet which servers accept email for a domain, and in what order of preference. A message to info@example.com is delivered by looking up the MX records of example.com and handing the mail to the server with the lowest priority number that answers.

What the row means

SiteScan looks up the MX records of the registrable domain (for shop.example.com, that is example.com) through a public DNS-over-HTTPS resolver. With one or more records the row is green and shows how many there are. With none it reads "No mail on this domain" as a neutral fact: plenty of domains — landing pages, redirect domains, project sites — deliberately do not receive mail. The mail-only records further down (MTA-STS, TLS-RPT, BIMI) appear only when MX records exist.

What to check

• If you expect mail, at least two MX hosts, or a provider whose single hostname is itself redundant, keep delivery going during an outage.
• Every MX must point at a hostname with an A or AAAA record, never directly at an IP address or at a CNAME.
• A domain that sends no mail should still publish v=spf1 -all as its SPF record and a DMARC policy of p=reject, so nobody can send mail in its name.