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Free Email Deliverability Tool
Paste your subject line and body to get an instant spam score. Catch spam trigger words, formatting red flags, link density issues, and length problems before they hurt your cold email deliverability.
Find the people & companies you need → Lessie AI
Drop in the exact subject line and message body you plan to send. The tool runs fully in your browser — nothing is stored or transmitted.
Our engine scores 8 deliverability dimensions in under a second — spam words, all-caps ratio, exclamation count, link density, length, and more. Pair with email verifier to confirm the recipient address is valid.
Review the issue list, apply the suggested fixes, and rescan until you hit your benchmark score. Need an AI-written rewrite? Try our cold email generator.
8 deliverability checks based on Gmail, Outlook, and SpamAssassin filter heuristics
Scans your subject and body against a dictionary of 40+ known spam trigger words across money, urgency, clickbait, and adult-pharma categories. Pair with bulk email verifier for full list hygiene.
Subjects under 30 or over 65 characters get flagged. The ideal range (30-50) maximizes mobile preview and avoids truncation across Gmail, Outlook, and Apple Mail.
Too many links is one of the strongest spam signals. We count http(s) URLs and warn when density exceeds inbox-safe ratios, especially for cold outreach.
Catches all-caps ratio, runs of !!! or ??? , and all-caps words — patterns that ESP filters punish hard. Build healthier lists with our email finder to keep bounce rates low.
Cold outreach lives or dies on the first impression. Run every template through the spam checker before launching a sequence. Combine with our cold email generator for a complete pre-send workflow.
Promo campaigns are spam-trigger magnets. Use the checker to validate copy edits before queuing the send, and confirm subscriber addresses with our bulk email verifier first.
Personalized cold emails still hit the spam folder if the copy looks promotional. Score every variation and find verified inbound contacts with our email finder.
Welcome, receipt, and reset emails must hit the primary inbox. The checker validates template copy stays clean of trigger words, all-caps, and excessive links.
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