Copy/paste an email copy in our free email spam checker to detect and remove spam words before you hit send.
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Spam analysis
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Email deliverability is shaped by more than one factor, but the words and formatting inside your message still matter. Subject lines packed with urgency, unrealistic promises, heavy punctuation, or suspicious money language can make a legitimate campaign look risky before a reader ever sees it.
Use this free email spam checker as a final copy review step before sending newsletters, cold emails, launches, and lifecycle campaigns. It helps you find phrases that may sound too aggressive, then rewrite them into clearer, more natural language that is easier for subscribers and inbox filters to trust.
Lumafly's free Email Spam Checker helps you validate cold emails, newsletters, and sales follow-ups before sending. It detects words that look unnatural, shady, overpromise, or create false urgency. By rephrasing spam trigger words and cleaning up formatting, you reduce deliverability risk before your campaign reaches Gmail, Outlook, or Yahoo inboxes.
Words that pressure recipients to act immediately
Urgency spam words create artificial time pressure so recipients act before thinking. Email filters flag phrases like "act now" and "limited time" because they mirror high-pressure sales and scam tactics.
Common triggers
Ethically or legally questionable phrases
Shady phrases mimic phishing, lottery scams, and account-fraud emails. Wording like "verify your account" or "security alert" erodes trust and often sends messages straight to spam.
Common triggers
Exaggerated or unrealistic claims
Overpromise language makes claims that sound too good to be true. Filters treat words like "guaranteed" and "miracle" as promotional hype, which hurts deliverability for legitimate marketing emails too.
Common triggers
Financial terms that trigger promotional filters
Money-related spam words signal discounts, income schemes, and financial offers. Even harmless terms like "free" or "discount" can raise spam scores when combined with urgency or excessive punctuation.
Common triggers
Phrases that don't sound like normal human writing
Unnatural phrasing reads like mass-marketing templates, not a real person writing to you. Generic CTAs such as "click here" and spam-adjacent terms are common reasons emails land in promotions or junk.
Common triggers
Copy your subject line and body into the checker, or paste the full message as-is.
We highlight spam trigger words across 5 categories and score your overall spam risk.
Swap flagged phrases for natural alternatives, then send with confidence.
Run the free email spam checker before launching cold outreach, lifecycle sequences, promotional newsletters, founder updates, webinar invites, coupon campaigns, and product announcements. It is especially useful when your draft contains urgency, discounts, income claims, repeated punctuation, or sales language that can make a legitimate message look like spam.
The tool is not a replacement for SPF, DKIM, DMARC, list hygiene, sending reputation, or a properly warmed domain. It is a fast content review layer for the part of deliverability you can fix immediately: subject line wording, body copy, formatting, link density, and phrases that sound unnatural.
A good workflow is to scan the first draft, rewrite flagged language, scan again, and then send a small test to yourself or a seed inbox before sending at scale. If the email still feels pushy after the scan, simplify the offer, remove exaggerated claims, and make the message sound like a real person wrote it.
Avoid over-polished sales claims, fake urgency, and phrases that a reader would never hear in a normal conversation. Natural copy is easier for both people and filters to trust.
Do not use fake reply prefixes, misleading promises, or all-caps subject lines. The subject should set up the email body clearly instead of forcing the click.
Words around prizes, guaranteed income, instant results, debt, and discounts can be valid in context, but too many of them together can make an email look risky.
Too many links, stacked punctuation, excessive capitalization, and strange spacing can hurt the perceived quality of an email even when the core message is useful.
Everything you need to know about spam checking
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