Specialist check
Free MX record lookup and checker
Look up a domain's MX records in priority order, detect the mail provider, and catch missing or null MX before replies are at risk.
- Checks
- Lists public MX routes in priority order, identifies null MX, and infers common receiving providers from hostnames.
- Cannot tell
- It cannot see mailbox licenses, routing rules, or a monitored reply inbox.
Expected time: about 5 to 20 seconds. Some public services can take longer.
Source: Live Google Public DNS. Routes are ordered from the answer returned during this run.
Questions
MX (Mail Exchange) records tell other servers where to deliver mail for your domain. No MX record means the domain cannot receive mail, which is a launch blocker for any inbox you expect replies on.
A lower MX priority number is tried first. A domain can publish several mail servers for failover, so read the records in ascending priority order. Equal priorities allow senders to choose between those hosts.
A null MX record is published as priority 0 with a single dot as the host. It explicitly says the domain does not accept email. For a cold email domain expected to receive replies, that is a launch blocker.
Run the domain through this checker and confirm public DNS returns smtp.google.com at priority 1 for a current setup, or the supported legacy aspmx host set for an older setup. Then confirm Gmail is active in Google Admin and send a real inbound test. DNS alone cannot verify the mailbox.
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