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Free tool · no signup
Enter a domain and this tool lists its MX records: the mail servers that accept email for it, in the order senders try them. It flags a domain with no MX records and one set to accept no mail at all, with no signup.
Each row is one mail server and its priority. The lowest number is tried first and higher numbers are backups. A host name ending in a provider's own domain, such as Google's or Microsoft 365's, is labelled so you can see at a glance whose servers receive your mail.
MX is half of the picture. The other half, who may send as your domain, lives in SPF, DKIM and DMARC. Check them with the deliverability checker, or build the records with the SPF and DMARC record generators.
MX records are set at your DNS host, not at your email provider. Open the DNS records for the bare domain, remove any MX records left over from a previous provider, and add exactly the ones your current provider lists. Mixing two providers' records in one set sends some of your mail to a mailbox you no longer use.
The same walkthrough for the other records is in SPF, DKIM and DMARC for cold email.
It names the mail servers that accept email for a domain. When someone sends to you@yourdomain.com, their server looks up the MX records for yourdomain.com and delivers to the server listed there. MX covers incoming mail only. SPF, DKIM and DMARC cover outgoing mail.
Senders try the server with the lowest number first and move to higher numbers only if it does not answer. Records with equal numbers share the load. A higher-numbered record is a backup.
A single MX record with priority 0 and an empty host (written as a dot). It tells senders the domain never receives email, so they stop trying at once instead of retrying. It is defined in RFC 7505, and it suits a domain used only for sending.
Some senders fall back to the domain's own A record when there is no MX, as RFC 5321 describes, but you should not rely on it. Replies and bounces to a domain with no MX can fail. Add the MX records your email provider lists at your DNS host.
No. MX shows where mail to your domain is delivered. Reaching an inbox depends on SPF, DKIM, DMARC and sender reputation. The deliverability checker reads SPF, DKIM, DMARC and MX in one go.
Check any domain's SPF, DKIM, DMARC, and MX records in seconds.
Validate an SPF record: one record, 10-lookup limit, and a safe ending.
Build a valid SPF record from your senders and IPs, with the lookup count.
Look up a DKIM key by selector and check its type, size and test mode.
Look up a DMARC policy, reporting address, pct and alignment.
Build a DMARC record, starting at p=none with reports, in plain words.
Check a domain or mail server IP against Spamhaus, SURBL, URIBL and more.
Scan a subject line and email body for spam-trigger phrases.
Get a day-by-day sending ramp schedule for a new or existing mailbox.
Check text-to-HTML ratio, images, links, and tracking pixels in an email.
Warmerly re-checks SPF, DKIM, DMARC and blocklists on every sending domain daily and warms your mailboxes while it does. Free plan, no card. Paid plans from $19/month.
