01
What MX does
MX records list the mail servers that accept email for your domain, in priority order.
Free security tool · no sign-up
MX Record Checker.
MX records decide which servers receive email for your domain. Make sure they point where you expect.
Free for AwareX client employees and anyone who needs a quick check. No sign-up required.
How to check, verify, and actTry an example:
DNS queried via Cloudflare. We don’t store your input.
Your workplace verification guide
Check it. Verify it. Know what to do next.
See which servers receive email for a domain. This reviews mail routing, not whether a message or sender is trustworthy.
Prepare your input
Enter the domain you want to review, such as example.com, without a page path.
Run the check
Select Check records. The tool requests the public DNS records through Cloudflare.
Review the result
Review the MX entries with your DNS or email administrator before making changes.
How to verify independently
Enter the domain after the @ in your work address.
Ask IT to compare the returned server names and priorities with your organization's approved email provider.
Check the result again after any recent mail change before treating it as a problem.
Your next workplace action
If routing looks unfamiliar or mail is failing, send the domain and records to IT. Do not edit mail routing yourself.
What the result means
- Mail servers returned
- Lower priority numbers are generally preferred. Multiple servers can be normal.
- 0 . (null MX)
- The domain explicitly indicates that it does not accept email.
- No MX returned
- This alone does not establish an outage or fraud. IT should review intended mail setup and fallback behavior.
A returned record is not a security verdict. Missing records can reflect configuration, propagation, or a lookup issue.
Why it matters
Review the route. Confirm the provider.
MX records identify incoming mail servers and their preferences. Compare them with your provider's setup instructions; this lookup does not test delivery, mailbox availability, or email authentication.
02
Check hosts and priority
Lower preference numbers are tried first. Compare unfamiliar hosts with your provider's published settings before treating them as a problem.
03
After a migration
Changed email providers? Confirm old MX entries are gone so mail flows only to the new service.
DNS standards · sourced facts
Small record.
Important details.
These SMTP specification facts explain how published mail routes are used. They are routing rules, not security statistics or a test of whether your mail service works.
0
Lower values come first
MX preference values are ranked from lower to higher. A value of 0 is preferred over 10; preference is not a trust score.
IETF · RFC 5321, section 5.1A / AAAA
Mail hosts need addresses
An MX target must resolve to at least one address record for its mail server. Publishing an MX entry does not check that server's availability.
IETF · RFC 5321, section 5.1No MX
Absence is not the whole answer
SMTP defines an implicit mail route to the host when no MX records exist. A missing MX result alone does not prove that delivery is impossible.
IETF · RFC 5321, section 5.1After the check
Records protect the domain.
People protect the inbox.
MX records describe mail routing, not phishing protection. A correctly routed inbox can still receive a convincing lure. AwareX is a separate training platform for the decisions employees make after a message arrives.
- Your domain
A route for incoming email
Confirm the listed hosts and preferences with your mail provider. MX records do not authenticate senders or determine whether a message is safe.
- The attacker
A request still needs scrutiny
Lookalike addresses, compromised accounts, SMS, calls, and deepfakes can reach employees regardless of the records returned by this check.
- AwareX
Your people get practice
Separately, AwareX provides contextual simulations and learning that help teams pause, verify, and report. This lookup does not run or validate those activities.
AwareX is AI-powered human risk testing: it learns your business, runs realistic simulations across email, SMS, voice, QR codes, and deepfakes, and adapts learning to how your people respond.
See AwareX in Action - Book a demoTHE PLATFORM BEHIND THE CHECKFive AI agents. One New Age
Five AI agents. One New Age
Human Risk Management platform.
This free tool shows one signal. AwareX is a New Age Human Risk Management platform: five AI agents work together to test your people the way attackers would, and to turn every response into learning.
Context engine
Learns your business from public context: departments, products, and tone, so every test is grounded in how your organization actually works.
Scenario engine
Drafts and scores attack scenarios against your scope, the way a real attacker would plan them.
Lure composer
Writes on-brand emails, messages, and calls with realistic signatures and sender identities, ready for your review.
Risk calibration
Compares predicted risk with how people actually respond, so the picture gets sharper after every wave.
Targeting and routing
Decides who needs practice next and routes learning to the people and teams that need it most.
Beyond the free check
See AwareX
in action.
A MX Record Checker result is one piece of the picture. Explore how AwareX connects realistic simulations, learning, and reporting for your organization.
- Explore scenarios tailored to your business.
- See campaign activity and learning progress together.
- Discuss setup, training, and ongoing support.
What this free tool checks
MX records decide which servers receive email for your domain. Make sure they point where you expect. This tool queries public DNS through Cloudflare and displays the MX records returned for your domain. Use the results to review your configuration; finding a record does not by itself confirm that your domain is secure.
Where we test
- ContextualAn AI agent scans the web
- EmailSpoofed senders and fake invoices
- SMSDelivery alerts and code traps
- VoiceUrgent calls from trusted numbers
- QR CodeCodes on posters and payment slips
- DeepfakeCloned faces and voices on calls
AIDrafted by AI, approved by you
THE IMPROVE FRAMEWORKIMPROVE.
IMPROVE.
One continuous loop.
Identify, Measure, Prioritize, Reduce, Optimize, Validate, and Evaluate. AI connects business context, employee responses, and targeted learning to inform each next test.
WHY TEAMS PARTNER WITH AWAREX
The benefits of partnering with AwareX
A free check tells you where you stand today. A partnership with AwareX turns that snapshot into a continuous, AI-powered program.
Contextual by default
Simulations are written from your sector, your roles, and current events, so every test feels real to the person receiving it.
Learning in the moment
Every response informs the next test and the lesson that follows it, so training adapts as your risk changes.
Evidence you can present
Dashboards, records, and compliance alignment give leadership and auditors a clear picture of progress.
Support at every step
Setup, campaign planning, and ongoing optimization from a team that runs these programs every day.
Frequently asked questions
Good questions.
Straight answers.
Free access, safe follow-up, and answers specific to this checker.
Yes. Every AwareX free tool is free to use, and you can run as many checks as you need.
No. There is no account, no sign-up, and nothing to install. Open the page, run the check, and read the result.
Share the result with your DNS or email administrator, close any gaps they identify against your provider’s recommended setup, and re-run the check to confirm the change.
MX records identify the mail servers responsible for receiving email for a domain. They describe incoming delivery, not the servers authorized to send email.
It is the preference value. Senders generally try lower numbers first. Higher numbers often identify backup servers; equal values allow delivery attempts across multiple servers.
No. This is a domain-level DNS lookup. It does not connect to the mail server or confirm that an individual email address can receive messages.
Cached DNS records may remain until their time-to-live expires. If old entries persist, check the authoritative DNS settings and compare them with the records required by your current provider.
THE NEXT ATTACK IS ALREADY BEING WRITTEN, BY AI