Email DNS Checker
Aggregate MX, SPF and DMARC signals into one email-domain diagnostics report.
Email
Free MX Record Lookup
Look up MX records, delivery priorities and whether a domain publishes usable mail exchangers.
Your input is processed only as required by this tool.
Free MX Record Lookup
MX records tell sending mail systems which hosts should receive email for a domain and in what preference order. This lookup returns the published exchangers sorted by priority and distinguishes real exchangers from a Null MX declaration that explicitly says the domain does not accept email.
How to use it
- Enter the public domain you want to inspect.
- Run the DNS check and review the published email configuration returned by the authoritative DNS path.
- Use the findings together with the related SPF, DKIM, DMARC and MX checks before changing production email DNS.
How to read the result
Lower MX preference numbers are tried first. Multiple records can provide redundancy, but the presence of MX records alone does not prove that a mailbox exists or that the receiving service is healthy.
Limitations
DNS responses can change because of propagation, split DNS or provider changes. A Null MX is intentionally treated as no usable mail exchanger rather than as a configured mail server.
Frequently asked questions
What does MX priority mean?
Lower preference numbers have higher priority and are normally attempted before higher-numbered exchangers.
What is Null MX?
An MX record pointing to a single dot declares that the domain does not accept email and must not be treated as a usable mail server.