spam placement
SpamAssassin Score Explained: What It Means and How to Lower It
SpamAssassin is one of the most widely used spam-filtering engines — many mail servers, hosting providers, and corporate email systems run it (or something modeled on it) behind the scenes. Understanding its scoring helps explain why an email gets filtered even when it looks fine to you.
How the score works
SpamAssassin runs each message through hundreds of individual rules. Every triggered rule adds points (a few subtract points for good signals). The categories that matter most:
| Category | Examples | Typical impact |
|---|---|---|
| Content | trigger phrases, excessive punctuation, HTML issues | +0.5 to +2 per rule |
| Authentication | missing/failing SPF, DKIM, DMARC | +1 to +4+ |
| Reputation | sender IP/domain on a blacklist | +3 to +6+ |
| Header anomalies | malformed headers, suspicious sending patterns | +1 to +3 |
What score gets you filtered
- 0–2: clean, low risk.
- 2–5: mild risk — some rules triggered, usually still delivered.
- 5.0+: the default threshold most SpamAssassin installs use to start marking mail as spam or rejecting it outright. Some strict setups use 3.0.
The biggest score reducers, in order of impact
- Fix authentication first. A failing SPF or DKIM check can add more points than a dozen wordy phrases combined. Run the SPF/DKIM/DMARC Checker.
- Check blacklist status. A single RBL hit is one of the heaviest single-rule penalties possible. Run the Blacklist Checker.
- Clean the content. Trigger words, ALL-CAPS, and link density each add smaller amounts, but they stack. Run the Email Spam Checker.
The takeaway
A SpamAssassin score is really a proxy for the same three things that decide any inbox-vs-spam outcome: content, authentication, and reputation — see why emails go to spam for the full picture. Fixing authentication and blacklist status usually moves the score more than wordsmithing ever will.
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Start free warmupSpamAssassin Score Explained — FAQ
What is a good SpamAssassin score?
Lower is better. A score of 0-2 is very clean, 2-5 is a mild risk, and 5.0+ is the default threshold most mail servers use to start filtering or rejecting mail as spam. Some strict configurations filter at 3.0. Aim for well under 5.0 with margin for content that varies per recipient.
How is a SpamAssassin score calculated?
SpamAssassin runs a message through hundreds of individual rules — content patterns (spammy phrases, HTML issues, formatting), authentication checks (missing/failing SPF, DKIM, DMARC), sender reputation (RBL/blacklist hits), and header anomalies. Each triggered rule adds (or occasionally subtracts) points; the total is the score.
Can one bad rule tank my score even if everything else is clean?
Yes. Failing DKIM or being on a blacklist can each add several points on their own — often more than a handful of trigger words combined. That's why fixing authentication and blacklist status usually has a bigger impact than obsessing over wording alone.
Do I need SpamAssassin installed to check my score?
No — you don't need to run SpamAssassin yourself to catch the content-level issues it weighs most. Our free spam checker scores the same categories of content signals (trigger words, formatting, link density) that SpamAssassin rules target, giving you a fast proxy without installing anything.