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Free Tool

Email Deliverability Checker

Enter your sending domain to check DNS records for SPF, DKIM, DMARC, and MX. See exactly what is keeping your emails out of inboxes, and how to fix it.

Enter a valid domain, e.g. acme.com

Running DNS lookups. This takes a few seconds.

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Checking...

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SPF Record
Pending
Checks whether your domain authorizes mail servers to send on its behalf.
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DKIM Record
Pending
Checks for a valid DKIM public key across common selectors.
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DMARC Record
Pending
Checks whether your domain has a DMARC policy to handle authentication failures.
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MX Records
Pending
Checks that your domain has mail exchange records and identifies your mail provider.

Why Deliverability Makes or Breaks Cold Email

Your copy does not matter if the email never reaches the inbox.

~20%
of commercial emails never reach the inbox, according to email benchmark research. Most senders never know it is happening.
3x
higher spam placement risk for domains missing DMARC. Receiving servers flag unauthenticated senders as suspicious by default.
48 hrs
maximum DNS propagation time after adding or editing SPF, DKIM, or DMARC records. Changes are not instant.
4 records
SPF, DKIM, DMARC, and MX are the baseline stack every sending domain needs before launching any outbound campaign.

What Each Record Does

SPF
Sender Policy Framework. A TXT record listing every IP address or mail service authorized to send email from your domain. Gmail and Outlook check this on every inbound message. A missing or broken SPF record is one of the fastest paths to the spam folder.
DKIM
DomainKeys Identified Mail. A cryptographic signature added to outgoing emails. The receiving server looks up the public key in your DNS and verifies the message was not altered in transit. Without DKIM, your emails have no tamper-proof identity signal.
DMARC
Domain-based Message Authentication. Tells receiving servers what to do when SPF or DKIM checks fail: monitor only (p=none), quarantine (p=quarantine), or reject (p=reject). It also enables aggregate reporting so you can see who is sending email pretending to be your domain.
MX
Mail Exchange records. Point to the servers responsible for receiving email at your domain. Some spam filters look for MX records as a basic legitimacy signal. A domain with no MX records often looks like a throwaway sending domain and is treated accordingly.

Frequently Asked Questions

What does this email deliverability checker test?
The checker tests 4 DNS records that directly affect whether your emails land in inboxes or spam: SPF (which mail servers are authorized to send on your behalf), DKIM (a cryptographic signature proving the email was not altered in transit), DMARC (a policy telling receiving servers what to do if SPF or DKIM fail), and MX records (the mail servers handling inbound mail at your domain).
Why are SPF, DKIM, and DMARC important for cold email?
Missing or misconfigured SPF, DKIM, and DMARC records are the most common reason cold emails land in spam. Gmail and Outlook use these records to verify sender identity. Without them, your domain has no authentication signal and spam filters treat your messages as suspicious by default. Domains with all 3 records properly configured see significantly higher inbox placement rates.
How do I fix a failed SPF, DKIM, or DMARC check?
SPF: add a TXT record at your root domain with your sending servers listed (e.g. v=spf1 include:_spf.google.com ~all for Google Workspace). DKIM: generate a key pair through your email provider, then add the public key as a TXT record at [selector]._domainkey.yourdomain.com. DMARC: add a TXT record at _dmarc.yourdomain.com with a policy like v=DMARC1; p=none; rua=mailto:dmarc@yourdomain.com. DNS changes can take up to 48 hours to propagate. The checker cards above include specific fix instructions for each failed record.
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