Pro move: type dmarc:yourdomain.com or blacklist:1.2.3.4 straight into the box — it switches tools for you.
About this tool. MX records tell the world which mail servers accept email for a domain. If they're missing or wrong, email simply doesn't arrive. This lookup lists every MX host in priority order, resolves each one to its IP addresses, and tells you which provider is behind it in plain English.
How to read your mx record lookup results
Records are shown lowest priority number first. The lowest number is tried first; the rest are backups.
Each host is resolved to its IP addresses and matched to a known provider so you can see who really runs the mail.
No MX at all means the domain cannot receive email. A single MX pointing at a dot (Null MX) means it is deliberately not accepting mail.
Common problems and how to fix them
Mail bounces but you have MX records
Confirm each MX hostname actually resolves to an IP. An MX pointing at a name with no A/AAAA record silently fails.
You switched email providers but mail still goes to the old one
Old MX records are cached. Lower the TTL before a move, then confirm the new records here after cutover.
Common questions.What is an MX record?
An MX (Mail Exchanger) record tells other mail servers which hosts accept email for your domain, and in what order to try them.
Why does my domain have more than one MX record?
Extra records with higher priority numbers are backups. If the primary is down, senders fall back to the next one.
Does an MX record affect deliverability?
Indirectly. Wrong or missing MX records stop mail from arriving at all. For whether your outbound mail lands in the inbox, check SPF, DKIM and DMARC.