Before you send an important message, an invoice reminder, or a bulk update to customers, it helps to know whether it will actually land in the inbox or get filtered into spam. A free spam score test checks your message and your domain's email settings, then gives you a report you can act on before you hit send to everyone.
Why Check Your Spam Score First
Spam filters on the receiving end (Gmail, Outlook, Yahoo, and others) look at more than just your message wording. They check whether your domain has the right authentication records in place, whether your sending IP has a poor reputation, and how your email is formatted. Testing first lets you catch problems on one test email instead of finding out after an entire campaign quietly disappears into spam folders.
How to Check Your Email's Spam Score
- Open a free email testing tool such as mail-tester.com in your browser.
- Copy the unique test email address it generates for you.
- From the email account you normally send from, compose a message as you normally would (subject line, body text, any attachments) and send it to that test address.
- Go back to the testing tool and click Check your score (or the equivalent button).
- Review the report, which scores your email out of 10 and lists exactly what passed and what didn't.
What the Report Tells You
A good report will typically check:
- Whether your SPF, DKIM, and DMARC records are set up and passing.
- Whether your sending IP address appears on any spam blacklists.
- Basic content checks, such as spammy phrasing, too many links, or a poor text-to-image ratio.
- Whether your message has a working unsubscribe option, if it's a bulk or marketing email.
Common Reasons for a Low Score
- Missing or incorrect SPF record: this tells receiving mail servers which servers are allowed to send email for your domain.
- DKIM not signing your messages: this adds a digital signature that proves your email wasn't altered in transit.
- No DMARC record: this tells receiving servers what to do with messages that fail SPF or DKIM.
- Your sending IP is on a spam blacklist, often because of a compromised email account sending spam in the past.
- Content issues, like writing your whole message in a single large image, using excessive capital letters, or overusing words that spam filters flag.
If you've just added or changed an SPF, DKIM, or DMARC record, wait for DNS to propagate before retesting. Testing too soon can show a false failure even though the record is correct.
If your report flags missing authentication records, see how to set up SPF and DKIM records. If it flags a blacklisted IP, see how to check if your domain or email IP is blacklisted. Once you've made changes, send another test message to confirm your score has improved before sending to your full list.