Free MX lookup
Free MX lookup and mail server checker
Run a free MX lookup to see which mail servers a domain advertises for inbound delivery, how priorities are ordered, and whether the live routing looks ready after migrations or DNS changes. Use it as a fast MX record checker when mail flow confidence matters.
Primary use
MX record lookup
Check the live inbound mail-routing state for any domain before assuming a migration is complete.
Routing signal
Priority order
Review whether primary and fallback exchanges are published the way the team expects.
Operational fit
Post-change validation
Use it after DNS edits, provider cutovers, or incident mitigation to confirm public state.
Output
Hosts + warnings
See the live exchange set and any issues worth reviewing before traffic depends on it.
Intent-led preview
MX lookup and mail server checker
Main action
MX lookup
What this page returns
Confirm live routing
See the public MX state instead of relying on what a DNS console says was published.
Review priority order
Make sure primary and fallback exchanges are exposed in the order the provider expects.
Catch post-migration drift
Use the lookup after provider changes so support or product email does not quietly route to the wrong infrastructure.
Primary use
MX record lookup
Check the live inbound mail-routing state for any domain before assuming a migration is complete.
Routing signal
Priority order
Review whether primary and fallback exchanges are published the way the team expects.
Operational fit
Post-change validation
Use it after DNS edits, provider cutovers, or incident mitigation to confirm public state.
Intent overview
What teams usually need from this tool page
The strongest tool pages answer the immediate question, make the next move obvious, and connect the free check to the broader MailSlurp workflow behind it.
Primary outcome
Confirm live routing
See the public MX state instead of relying on what a DNS console says was published.
Workflow signal
Review priority order
Make sure primary and fallback exchanges are exposed in the order the provider expects.
Workflow signal
Catch post-migration drift
Use the lookup after provider changes so support or product email does not quietly route to the wrong infrastructure.
Run a free lookup
Check the live MX routing for a domain
Enter the root domain. This MX checker returns the advertised exchanges, their priority ordering, and any warnings that deserve review before the next mail-dependent launch.
Product workflow
Take mx lookup and mail server checker beyond a one-off run
Use the free tool for the fast answer. Use the product workflow when the check needs history, owners, automation, and a place in your release or sender-health process.
Saved history
Keep every important run in one shared workflow
Use mx lookup and mail server checker as a repeatable checkpoint instead of relying on screenshots, scattered notes, or one person's memory.
Automation
Turn one-off checks into release and migration gates
Trigger the same verification from CI, internal tooling, or launch checklists so DNS, deliverability, and QA decisions stay consistent.
Ownership
Route failures to the right team before they become incidents
Move from ad hoc triage into shared operational visibility with alerting, escalation paths, and clearer accountability.
Next step
Move from a fast answer into a repeatable MailSlurp workflow
The free check is built for speed. The product path is where you save runs, automate verification, and give the right owner enough context to act before the next launch or incident review.
Recommended actions
Best fit
Use this after DNS edits and mail-provider cutovers
MX lookup is strongest when the inbound routing state matters immediately: after migrations, while debugging missing inbound mail, or before relying on a support or sender domain in production.
- Validate inbound routing after provider migrations
- Check priority order before switching traffic
- Confirm support and reply domains still accept mail publicly
Upgrade path
Connect routing checks to sender-domain reviews
MX lookup answers the inbound DNS question. Production teams usually combine it with SPF, DKIM, DMARC, and domain-health checks when mail reliability needs named ownership.
- Review routing and sender auth in one workflow
- Monitor domain health before launch windows
- Shorten incident triage when mail paths change
What this returns
An MX lookup should answer the inbound routing question quickly
The useful output is not only the raw record. It is whether the expected exchanges are live, how they are prioritized, and whether there are warnings that suggest routing or migration follow-up.
Exchanges
Live hosts
See which mail exchanges receivers can actually resolve for the domain.
Priority
Routing order
Confirm primary and fallback exchange order instead of guessing after DNS edits.
Warnings
Review notes
Catch issues that deserve review before support or reply flows depend on the route.
Workflow
Post-change check
Use it immediately after migrations or provider cutovers as part of change review.
Operational use
Best used during migrations, support-route validation, and incident triage
Searchers usually need an MX lookup because mail is changing or already failing. Treat this page as part of change control and diagnosis, not as a static DNS reference.
After provider migration
Re-run the lookup after cutover so the team knows the public route now points at the intended provider.
Support and reply domains
Confirm customer-facing domains still advertise a healthy inbound route before support traffic or replies are affected.
Mail-flow incidents
Use the live record set as a shared starting point before escalating to provider-specific delivery logs or transport checks.
FAQ
Questions teams ask before they operationalize this workflow
What does an MX lookup tool check?
An MX lookup fetches the public mail-exchange records for a domain so you can confirm which inbound mail servers are advertised, what priorities they use, and whether the routing looks consistent with the provider you expect.
Why should teams run an MX record check after migrations?
MX changes often look complete in a DNS console before the live routing state is fully validated. A lookup confirms the public result after provider cutovers, tenant moves, or recovery changes.
What if no MX record is found?
Some domains intentionally do not receive email, but for production sender or support domains this usually means inbound routing is incomplete or published on the wrong zone.
Does MX lookup replace SPF, DKIM, or DMARC checks?
No. MX lookup answers the inbound routing question. Sender trust still depends on SPF, DKIM, and DMARC when outbound delivery reliability matters.