Email Deliverability Checker – SPF, DKIM, DMARC and Spam Score

What is email deliverability?

Email deliverability is the ability of your messages to reach the inbox instead of the spam folder or being rejected. It depends on technical setup, your sending reputation and the content of your emails. Three DNS records are especially important: SPF, DKIM and DMARC. Since 2024, large providers such as Gmail and Yahoo require bulk senders to authenticate their mail with these standards. This tool checks your domain's records live and grades your setup, then lets you check an email subject and body for common spam signals.

What the checker tests

• MX records: show where mail for your domain is received.
• SPF: lists the servers allowed to send email for your domain. It should end with a policy such as -all or ~all.
• DKIM: adds a digital signature to your messages. The tool looks for keys on common selector names or on a selector you enter.
• DMARC: tells receivers what to do with mail that fails SPF and DKIM and where to send reports.
• MTA-STS and BIMI: optional records that improve security and brand display.

How the checks work

The tool sends DNS queries through a public DNS-over-HTTPS service and reads the records it gets back. No mail is sent, and the checker does not need access to your email account. Only the domain name leaves your browser. The email content check runs entirely on your device and looks for spam trigger words, excessive capitals or punctuation, too many links, missing unsubscribe text and very short messages with links.

How to fix common problems

1. No SPF record: add a TXT record that includes your email provider, for example "v=spf1 include:provider.example -all".
2. More than one SPF record: merge them into one. Multiple records cause SPF to fail.
3. No DKIM: enable DKIM in your email service and publish the key it gives you.
4. No DMARC: publish a TXT record at _dmarc with p=none and a reporting address, then move to quarantine and reject once reports look clean.
5. Too many lookups: SPF allows ten DNS lookups. Remove unused includes.

Tips for staying out of spam

• Send only to people who agreed to hear from you and make unsubscribing easy.
• Keep your list clean by removing bounced and inactive addresses.
• Warm up new domains by sending small volumes first.
• Use a consistent From name and a real reply address.
• Avoid misleading subject lines and use a plain, helpful tone.
• Monitor complaint rates and aim to keep them very low.

Common mistakes to avoid

• Sending marketing email from a free mailbox address.
• Publishing DMARC with a strict policy before all your senders are authenticated.
• Forgetting third-party tools such as invoicing, CRM and newsletter services that send mail on your behalf.
• Assuming a good grade guarantees inbox placement. Reputation and content also matter.

Privacy and limits

The tool tests public DNS records only. It cannot see your sender reputation, blocklists, engagement or spam folder placement. DKIM can use any selector name, so a missing key on common selectors does not prove that DKIM is not set up. Enter your provider's selector for an exact check.

Related tools

Measure results with the Email Marketing ROI Calculator, improve your subject lines with the AI Marketing Toolkit, and check your site with the Website Security Scanner.