how to check if email domain has mx records
How to check if email domain has MX records
Use DNS lookup tools or an API to see whether a domain is configured to receive mail.
MX records are the first real sign that a domain can accept email.
You can check them with dns tools, system libraries, or a dedicated API.
The result should be combined with syntax and disposable checks.
dig MX example.com
nslookup -type=mx example.comWhat command is common?
The standard lookup uses an MX query against DNS.
What if MX is missing?
Some domains still accept mail through fallback behavior, so treat it as a risk signal.
How MX lookup fits into the chain
MX checks are the first deliverability gate after syntax validation. If a domain cannot publish mail exchanger records, you already have a strong reason to reject or flag the address before spending time on deeper probes.
Operational tradeoff
MX lookup is inexpensive and fast, but it does not prove mailbox ownership. The best implementation treats it as a domain health signal and combines it with disposable-domain checks, score thresholds, and a clear user message.
FAQ
How do I use this page?
Use it as a quickstart reference and link it from your docs, onboarding flow, or marketing page.
What should I do next?
Create an account, try the demo, and move the integration into your backend with a real API key.
Should I block missing MX?
Usually yes for consumer signup flows, unless you intentionally support edge cases like custom routing.
Does MX guarantee inbox delivery?
No. It only indicates where mail should be delivered; the mailbox can still be unreachable or rejected later.