Free MX Lookup Tool
Look up any domain's MX records instantly. See which mail servers handle a domain's email, detect the email provider (Google Workspace, Microsoft 365, and more), and check whether SPF is configured.
25 free lookups per IP per day. Checks public DNS: MX records, mail provider, and SPF. No data is stored.
Used by 1,500+ GTM teams
Who uses the Free MX Lookup Tool?
Teams across go-to-market rely on clean, verified data. Here is where this tool fits.
Email ops
Confirm a sending domain's MX and SPF are set up correctly.
Outbound teams
Spot dead or parked prospect domains before you send.
RevOps
Diagnose why mail to a specific company keeps bouncing.
Developers
Verify mail routing when configuring a new domain.
About This Tool
An MX (Mail Exchange) lookup shows you which mail servers are responsible for receiving email for a domain. Enter a domain or email address, and this tool returns the domain's MX records ranked by priority, detects the email provider behind them (Google Workspace, Microsoft 365, Zoho, Proofpoint, and 15+ others), checks whether the domain has an SPF record, and explains what each result means for deliverability.
What MX records tell you: every domain that can receive email publishes MX records pointing to its mail servers. If a domain has no MX records, it cannot receive mail, which is a fast way to spot dead or parked domains before you waste a send. com in the records means Google Workspace) tells you how a recipient's mail is filtered, which matters when you're troubleshooting why messages to a particular company keep bouncing or landing in spam.
Why outbound and ops teams check MX before sending: an MX lookup is a quick health check on a sending or receiving domain. Confirming your own domain's MX and SPF are configured correctly is table stakes for deliverability, missing or misconfigured records are a common reason legitimate mail gets rejected.
Checking a prospect domain's MX confirms the domain is live and able to receive your outreach at all.
The connection to a clean list: MX configuration is one signal in a much bigger deliverability picture. A domain can have perfect MX and SPF records and still bounce your message because the specific mailbox you're emailing no longer exists. That mailbox-level check is what protects your sender reputation, and it's what Cleanlist does at scale: verifying every address on your list across 15+ providers at 98% accuracy, including the live MX and SMTP checks this tool previews for a single domain.
Use this lookup to spot-check one domain; use Cleanlist to verify a whole list before you send. To check whether a sending domain is already flagged, pair this with the email blacklist checker. Privacy note: this tool queries public DNS records only and does not store the domains you look up.
One domain checks out. What about your whole list?
MX records confirm a domain can receive mail, but not that the mailbox exists. Cleanlist runs live MX and SMTP checks on every address on your list across 15+ providers. 30 free credits, no card.
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Frequently Asked Questions
What is an MX lookup?
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An MX (Mail Exchange) lookup retrieves a domain's MX records, which are the DNS entries that name the mail servers responsible for receiving email for that domain. The lookup shows each mail server and its priority, so you can see where a domain's email is handled and which provider runs it. Enter any domain or email address above to run a lookup instantly.
What does it mean if a domain has no MX records?
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No MX records means the domain cannot receive email. The domain may be parked, dead, or used only for a website. For outbound teams this is a useful signal: sending to an address at a domain with no MX records guarantees a bounce. Cleanlist runs this MX check, plus mailbox-level verification, across your whole list automatically so you never send into a dead domain.
How do I find the email provider for a domain?
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The MX records reveal it. Records pointing to google.com or googlemail.com indicate Google Workspace; outlook.com or protection.outlook.com indicate Microsoft 365; others point to Zoho, Proofpoint, Mimecast, and so on. This tool detects and names the provider automatically from the MX hostnames, so you don't have to recognize them yourself.
Does correct MX configuration mean my emails will be delivered?
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Not on its own. MX records confirm a domain can receive mail, but delivery to a specific person also depends on whether that mailbox exists, your sender reputation, and your bounce rate. The highest-leverage step is verifying each address on your list before you send. Cleanlist does this across 15+ providers at 98% accuracy, catching the dead mailboxes that pass an MX check but still bounce.
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Verified data enrichment and email verification across 15+ providers. 30 free credits, no card required.
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