How this check works
We query the domain’s MX records and sort them by preference. Review unexpected destinations against the provider that receives your mail. No MX is not proof that delivery is impossible: SMTP can fall back to address records, which this tool does not test for mail delivery.
Lower numbers get tried first
MX preference values establish delivery order. A server with preference 10 is normally tried before one with preference 20. These values do not measure server quality or performance.
A null MX is intentional
A single record with preference 0 and destination dot declares that a domain does not accept email. That can be appropriate for a domain used exclusively for a website.
Common questions
Do correct MX records guarantee delivery?
No. This lookup does not connect to SMTP servers or check mailbox existence, filtering or provider outages.
Do MX records authorize outgoing mail?
MX directs incoming mail. SPF and DKIM are separate mechanisms for authenticating outgoing mail.