MX Record Lookup
See which mail servers receive email for a domain, in priority order, with their IP addresses and reverse DNS.
Free, no account needed.
What this check looks at
- Every MX record and its priority (lower numbers are tried first).
- The IPv4 and IPv6 addresses each mail server resolves to, and their reverse DNS names.
- Problems such as MX records that point to an IP address or a CNAME, servers that don't resolve, or a missing MX record.
- Which email provider the domain uses, such as Google Workspace or Microsoft 365, when it can be identified.
No MX record?
Without an MX record, senders fall back to the domain's A record, which usually isn't a mail server, so mail bounces or disappears. If the domain should never receive email, publish a "null MX" (priority 0 and a single dot) so senders fail fast.
Frequently asked questions
What does MX priority mean?
Senders try the server with the lowest number first and move to higher numbers only if it doesn't answer. Records with equal priority share the load.
How long do MX changes take?
Up to the record's TTL, often an hour or less. Some resolvers cache longer, so keep the old servers accepting mail for a day after switching.
Related tools
- SMTP Server TestConnect to a mail server on port 25 and check its greeting, STARTTLS support and TLS certificate, just as a sending server would.
- Email Blacklist CheckCheck an IP address or domain against widely used DNS blocklists, the lists mail servers consult to reject spam.
- Email Domain Health CheckRun every email and DNS check for a domain at once and get a single report with everything that needs attention.
- Reverse DNS (PTR) LookupFind the hostname an IP address points back to. Mail servers check this before accepting email.