SPAM SCORE CHECKER
Paste your email subject and body below. We'll score your content against 500+ known spam triggers and tell you exactly what to fix before you send.
Issues Found
HOW THE SPAM SCORE CHECKER WORKS
MailFlagger's free email spam score checker evaluates your email content against the same rule sets used by SpamAssassin, which powers deliverability decisions at thousands of mail servers worldwide.
The tool scores each element independently before producing a combined score from 0 to 100. A score above 75 indicates your content is unlikely to trigger spam filters. Below 50 suggests significant issues that should be addressed before sending.
Unlike black-box tools, MailFlagger shows you exactly which elements triggered each flag — so you know precisely what to fix.
What Gets Checked
- ✓ 500+ spam trigger words — "FREE", "GUARANTEED", "NO RISK", "ACT NOW" — phrases heavily weighted by Bayesian spam filters
- ✓ Excessive capitalization — ALL CAPS words signal aggression and are a top spam indicator across all major filters
- ✓ Punctuation abuse — Multiple exclamation marks (!!!) in subject lines dramatically increase spam scoring
- ✓ URL shorteners — bit.ly, tinyurl.com, and goo.gl are blacklisted by most spam filters
- ✓ Subject line length — Over 70 characters gets truncated in most clients and may appear deceptive
- ✓ CAN-SPAM compliance — Marketing emails require an opt-out mechanism — missing one is a legal risk and a spam signal
- ✓ Link density — More than 5 links relative to content length is flagged by many filters
Frequently Asked Questions — Email Spam Scoring
- What spam score is good enough to send?
- Aim for a score of 75 or above. Scores between 50–74 suggest filtering at stricter providers like Gmail. Below 50 means fix the flagged items before sending to any large list.
- Does a good spam score guarantee inbox delivery?
- No — content is just one of three layers. You also need a clean sending reputation (Blacklist Checker) and valid SPF, DKIM, and DMARC records (DNS Validator). All three must pass for reliable inbox delivery.
- Why is "free" a spam trigger word if I'm running a legitimate promotion?
- Spam filters are trained on historical patterns — "FREE" has appeared in billions of spam messages. You can still use it, but rephrase where possible: "complimentary", "on us", or "no charge" carry far lower spam weighting.
- Should I test both HTML and plain text versions?
- Yes. Spam filters often analyze the plain text alternative as well. If your plain text version is missing or significantly different from your HTML, that discrepancy itself can be flagged. Test each version separately.