Spam Checker
Paste a draft and get a transparent content check: 26 weighted rules, a 0–10 score, and the exact quoted evidence and a concrete fix for every triggered rule. No black-box scoring, nothing uploaded.
Features
26 weighted content rules: trigger phrases, caps and punctuation, link patterns, and deception signals like fake Re: prefixes and lookalike Unicode
0–10 score with four verdict bands, weighted in the spirit of SpamAssassin-style additive scoring
Per-rule breakdown: points, the exact evidence quoted from your draft, and one concrete fix
Also lists the rules your draft passed — not just the failures
Copy-to-clipboard plain-text report, plus a one-click spammy example to see the engine work
Runs entirely in your browser: instant results, nothing pasted is uploaded or stored
How to Use
Paste your subject line and email body (plain text or HTML)
Click "Check for spam signals" — results are instant and local
Read the score, then the rule-by-rule evidence
Apply the fixes and re-run until the flags clear
Run one send-based test before a real campaign — content checks cannot see SPF/DKIM or sender reputation
Use Cases
Frequently Asked Questions
- What is a good spam score?
- In SpamAssassin's additive model — which this tool's weights follow — the default spam threshold is 5.0 points, so staying under about 2 is comfortable and 5+ usually means the spam folder. Here, under 2 reads 'Looks clean'; above 4.5 means several classic filter rules are firing at once.
- What does 10/10 on mail-tester actually mean?
- That a real received email passed a disclosed checklist: a vanilla SpamAssassin scan plus SPF/DKIM/DMARC alignment, blacklist lookups and list-header checks. It is not an inbox guarantee — Gmail and Outlook weight sender reputation and engagement above content, which no tester can score for you.
- Why do my emails go to spam even though the content looks clean?
- Because content is only one input. SPF, DKIM and DMARC are domain-level authentication that cannot be judged from pasted text at all, and sender reputation and list quality usually matter more. If this tool shows a clean draft and mail still lands in spam, the problem is the sending setup — run one send-based test to see it.
- Which words or content patterns trigger spam filters?
- Trigger words alone matter less than they did in 2005, but measurable patterns still do: a high caps ratio, exclamation density, URL shorteners, suspicious TLDs (.tk, .top, .loan and similar), raw IP-address links, image-only bodies, bulk-style copy with no unsubscribe link, and mixed-script lookalike characters — that last one is a phishing fingerprint that triggers hard filtering.
- Does SpamAssassin still matter for reaching Gmail and Outlook inboxes?
- As a floor, yes: many corporate gateways still run it, and Postmark exposes it as a free check. But the big freemail providers layer machine learning and reputation on top, so a clean content score is necessary, not sufficient. Treat this tool as the content floor and authentication as the rest of the building.
- Do Gmail and Yahoo have hard requirements for bulk senders?
- Yes — enforced since February 2024: bulk senders need SPF and DKIM, a DMARC policy, one-click List-Unsubscribe, and a spam-complaint rate under 0.3%. That is exactly why this tool flags bulk-style copy that has no unsubscribe link.
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