Free Email Spam Checker: Test Your Spam Score Before You Send

Paste your email — subject line, body, and (optionally) raw headers — into the spam checker above. In seconds, you'll see a SpamAssassin score, the individual rules triggered, and concrete suggestions for getting your message out of the spam folder and into the inbox. The tool is free, requires no signup, and runs the same SpamAssassin engine used by millions of mail servers worldwide.

Email Spam Checker: Improve Email Deliverability with SpamAssassin

Apache SpamAssassin is a powerful open-source spam filtering platform designed to detect and filter unwanted emails. It integrates directly with mail servers to automatically block spam emails or can be run by users for individual mailboxes.

Beyond its primary function as a spam filter, SpamAssassin is widely used by email marketers and senders to evaluate email deliverability. It’s also built into popular email verification and deliverability tools, like MailerCheck, to help ensure emails reach the inbox.

How to find raw email in Gmail

To find the raw email in Gmail, follow these steps:

• Open Gmail in your web browser.
• Click the email you want to check.
• Click the three vertical dots in the upper-right corner of the email.
• Select “Show original” from the dropdown menu.
• Copy the raw email text that appears in a new tab.

How SpamAssassin Scores Emails to Detect Spam

SpamAssassin assigns a spam score to emails by running them through over 700 tests that check for common spam characteristics. The lower the spam score, the better your email’s chances of landing in the inbox. Emails scoring higher than 5 are typically marked as spam by default.

SpamAssassin uses advanced techniques such as Bayesian filtering, blocklists, DNS lookups, external programs, and online databases to evaluate emails for spammy traits.

You don’t need to understand every test, but knowing how SpamAssassin calculates its scores is important for improving your email deliverability.

• Each checked attribute receives a score indicating the likelihood of spam. These individual scores are summed up to form your final SpamAssassin score.
• 👍 Negative scores are ideal, as they indicate a low likelihood of spam, reducing your overall score.
• 🙂 A score of “0” is neutral, meaning it neither helps nor hurts your deliverability.
• 👎 Positive scores indicate potential spam, raising your overall spam score.

Why SpamAssassin Scores Matter for Email Deliverability

Many email providers use SpamAssassin as part of their spam detection process. A high spam score can significantly damage your email deliverability, causing your messages to land in the spam folder instead of the inbox.

For example, if your SpamAssassin score is over 5, there’s a high chance your email will be flagged as spam. However, even a score below 5 doesn’t guarantee inbox delivery, as each inbox provider has its own spam threshold and filtering criteria.

Best Practices: Keeping Your SpamAssassin Score Low

Email providers and mail server administrators can customize their SpamAssassin thresholds. Although the default threshold is 5, administrators are encouraged to adjust it based on their needs, often setting lower limits.

Because email administrators can change their threshold to anything they deem appropriate, it’s essential to aim for the lowest possible SpamAssassin score. Don’t settle for a score of 5. Some providers might reject emails with scores above 3, blocking them from the inbox altogether.

To maximize your email deliverability, aim for a SpamAssassin score below 4. The ideal range is between 0 and 2. If your score is above 2, review and fix the issues affecting your email's spam score to improve its chances of reaching the inbox.

Common SpamAssassin Rules That Hurt Deliverability

These are the rules most likely to add points to your score. Fix these first:

• HTML_IMAGE_ONLY_* — Your email is almost entirely images with very little text. Add real text; screen readers and spam filters both penalize image-only mail.
• MISSING_MID — No Message-ID header. Your mail server or SaaS tool should generate this automatically; if it's missing, there's a configuration problem.
• MISSING_DATE — The Date header is missing or malformed.
• HTML_MESSAGE — Small penalty simply for being HTML. Offset with good authentication and clean content.
• URIBL_* / RCVD_IN_* — A link in your email or your sending IP appears on a known blocklist. Check links and IP reputation with our IP lookup tool.
• SPF_FAIL / DKIM_INVALID / DMARC_FAIL — Authentication is broken. This is the single biggest fix for most senders. Configure SPF, DKIM, and DMARC records on your sending domain.
• BODY_URI_ONLY — The email body is little more than a link. Add real, relevant text around the link.
• MONEY_FORM_* / MONEY_FRAUD_* — Classic spam-trigger phrasing around money and urgency. Rewrite.
• T_FILL_THIS_FORM_* — Aggressive "fill this form" language. Soften the CTA.

Words and Phrases That Trigger Spam Filters

No word is an automatic spam verdict — filters weigh context. But the following patterns reliably add spam points, especially in subject lines:

• Urgency and pressure — "Act now", "Limited time", "Urgent", "Don't miss out", "Offer expires", "Last chance".
• Money and guarantees — "Free money", "Make money fast", "Guaranteed income", "100% free", "No cost", "Earn $$$".
• Exaggerated claims — "Miracle", "Revolutionary", "Breakthrough", "Secret formula", "Amazing offer".
• All-caps and excessive punctuation — "BUY NOW!!!", "FREE OFFER!!!". Use sentence case and restrained punctuation.
• Spam-adjacent industries — Weight loss, pharmaceuticals, gambling, cryptocurrency, and adult content words carry baseline spam weight.

A Practical Checklist to Lower Your Spam Score

1. Set up SPF, DKIM, and DMARC on your sending domain. Check with dig TXT or an online tool — misconfigured records are worse than missing ones.
2. Use a dedicated sending domain or subdomain. Never send bulk mail from your primary corporate domain if it handles executive correspondence.
3. Warm up new domains and IPs. Start with small, engaged lists and gradually increase volume over 2–4 weeks.
4. Keep HTML simple. Balance text and HTML, use plain-text alternatives, avoid excessive styling, and skip tracking pixels on cold outreach.
5. Include a physical mailing address and unsubscribe link. Required by CAN-SPAM; expected by every inbox provider.
6. Test every campaign. Run subject + body through this spam checker before scheduling. Fix anything scoring above 2.
7. Verify your list. Invalid addresses cause bounces that crater sender reputation. Use our bulk email verifier before every send.
8. Monitor reply and engagement rates. Low engagement is a deliverability killer. Prune disengaged recipients quarterly.

How This Email Spam Checker Works

When you paste an email, our server runs it through SpamAssassin 4.x with an up-to-date rule set. Each matched rule contributes a positive or negative score; the final number is the sum. Along with the score, you get:

• A line-by-line breakdown of every rule that fired, with its contribution to the total.
• A severity label (Inbox / Risky / Likely Spam) to translate the raw number into action.
• Concrete suggestions for the top offending rules so you know what to fix first.

For the most accurate score, paste the full raw email (headers and body) rather than just the subject and body. Authentication failures — the largest deliverability problem for most senders — only show up when headers are included.

Beyond the Spam Score: Other Deliverability Signals

A clean SpamAssassin score is necessary but not sufficient. Gmail, Outlook, and Yahoo also weigh:

• Sender reputation — Historical bounce rate, spam complaint rate, and engagement for your sending domain and IP.
• Authentication alignment — SPF and DKIM results must align with the From domain for DMARC to pass.
• List quality — Clean, opted-in lists outperform purchased or scraped lists every time.
• Engagement — Opens, replies, and forwards signal to ISPs that recipients want your mail.

Frequently Asked Questions

What is a good spam score?

Aim for a SpamAssassin score between 0 and 2. Scores above 5 are flagged as spam by default; many stricter receivers use limits as low as 3.

Why does my email have a high spam score?

Common culprits: spam trigger phrases in the subject or body, heavy HTML with little text, all-image layouts, missing SPF/DKIM/DMARC, broken or missing unsubscribe links, and links to blocklisted domains.

How do I check my spam score before sending?

Paste the subject, body, and headers of your email into the spam checker above. You'll get the score and a rule-by-rule breakdown in seconds.

Does this checker analyze headers, body, or both?

Both. SpamAssassin evaluates headers (including SPF, DKIM, DMARC), HTML structure, text content, and links. Paste the full raw email for the most accurate score.

Is the email spam checker free?

Yes. For bulk deliverability audits, automated API access, or pre-send scoring on every campaign, see our paid plans.

My email passes the spam checker but still goes to spam. Why?

Your content is clean, but your sender reputation or authentication might be the problem. Check SPF/DKIM/DMARC records, review bounce and complaint rates, and verify your list with our bulk email verifier to rule out list-quality issues.

Can this replace testing with Gmail, Outlook, and Yahoo directly?

No — it complements that testing. SpamAssassin scoring catches content and authentication issues; seed-list testing (sending to real inboxes across providers) catches provider-specific quirks. Do both for high-stakes campaigns.