MX record lookup

What MX records are

MX (mail exchanger) records tell the internet which servers accept email for a domain. Each record has a priority number: senders try the lowest number first and fall back to higher ones if it is unavailable. A domain with no MX records generally cannot receive email (senders may fall back to the A record, but most domains that want mail publish MX).

Four ways outreach teams use an MX lookup

• Before you pitch: no MX records means any address you guessed for that site will bounce. Skip it or find another contact route.
• Guess the right email format: Google Workspace and Microsoft 365 domains usually use first@ or first.last@. Pair this with the email permutator.
• Check your own sending domain: if it has no MX, replies to your pitches bounce and some receivers score you as suspicious.
• Spot security gateways: Mimecast or Proofpoint in the MX can mean stricter filtering, so keep pitches plain.

Reading the results

Priority: lower wins. Mail server: the hostname receiving mail. IPv4: the addresses it resolves to, which you can paste into the blacklist checker. Provider: our match from the hostname, for example aspmx.l.google.com is Google and *.mail.protection.outlook.com is Microsoft 365.