Rémi Kokabi | Updated August 10, 2026 | 7 min read

Spam words won't send you to spam (but here are 120 to avoid anyway in 2026)

Spam words won’t send you to spam (but here are 120 to avoid anyway in 2026)

One in six legitimate marketing emails never reaches the inbox. That’s according to Validity’s 2025 Email Deliverability Benchmark Report, and it applies to marketing messages that people actually opted into. Cold outreach? Harder. The inbox is a competitive place, and the filters guarding it have gotten smarter.
In this post, I’ll cut through the noise on spam trigger words. You’ll learn whether they actually matter (spoiler: less than you think), get a categorized list of 120 spam triggers to reference before you send, and walk away with the setup that actually keeps your emails out of spam.

Do spam trigger words still matter?

Yes, obviously. If you stuff your subject line with “FREE CASH NOW!!!” you’re going to have a bad time. Conceded.
But here’s the thing: modern spam filters weigh sender reputation, authentication records, and complaint rates far more heavily than any single word you type. Gmail’s sender guidelines are explicit. They want senders to keep the spam rate reported in Postmaster Tools below 0.10%, and they warn that hitting 0.30% or higher puts you at serious risk. They also require that your content be “accurate, and not misleading or deceptive.”
So the filter isn’t scanning for “discount” and slamming you into spam. It’s looking at whether real people report you, whether your domain checks out, and whether your sending behavior looks legitimate. Cleaning up your vocabulary helps at the margins. It won’t rescue a burned domain or a list full of people who never asked to hear from you. If spam placement is already a problem for you, start with our guide to improve email deliverability & avoid the spam folder.

120 spam trigger words to avoid, by category

Below, I’ve grouped 120 spam trigger words into eight categories: urgency and pressure, money and finance, free and discount, exaggerated claims and hype, guarantees, sales and marketing jargon, scam-adjacent language, and formatting flags. Use this as a reference, not a rulebook. No mailbox provider publishes an official banned-word list, so treat these as high-risk patterns rather than a hard blocklist. For a deeper breakdown of each category, see our full list of spam words to avoid.
Category
Triggers to watch
Urgency & pressure
Act now, Urgent, Limited time, Don’t delay, Expires today, Apply now, Order now, Call now, Get it now, While supplies last, Final notice, Last chance, Time-sensitive, Deadline, Instant access
Money & finance
Cash, Cash bonus, Earn extra cash, Make money, Money back, Double your income, Extra income, Income from home, Big bucks, Fast cash, Save big money, Million dollars, Pure profit, Financial freedom, Be your own boss
Free & discount
Free, 100% free, Free gift, Free access, Free consultation, Free quote, Free membership, Buy direct, Discount, Clearance, Bargain, Lowest price, Best price, Save up to, Special promotion
Exaggerated claims & hype
Amazing, Incredible deal, Unbelievable, Once in a lifetime, Miracle, Breakthrough, You won’t believe, Jaw-dropping, Life-changing, Revolutionary, The best, Guaranteed results, Instant results, Secret, Insane
Guarantees & risk removal
Satisfaction guaranteed, Money-back guarantee, No questions asked, Refund, Risk-free, No catch, No obligation, No strings attached, Cancel anytime, 100% satisfied, Promise you, Certified, Proven, No risk, Full refund
Sales & marketing jargon
Increase sales, Increase traffic, Boost your, Click here, Click below, Click to remove, Direct email, Direct marketing, Opt in, Subscribe, This isn’t spam, Not spam, Bulk email, Multi-level marketing, Performance
Scam-adjacent
Winner, You’ve been selected, Claim your prize, Prize, Lottery, Casino, Viagra, Weight loss, Lose weight, Meet singles, Passwords, Investment, Credit card offers, Pre-approved, Congratulations
Formatting & symbol flags
ALL-CAPS subject lines, Excessive exclamation marks, Dollar signs ($$$), Multiple font colors, Hidden text, Spammy emojis, Misleading subject lines, Excessive punctuation, Fake “Re:” or “Fwd:”, URL shorteners, Attachment-heavy emails, Image-only emails, Overuse of red font, Tiny or invisible fonts, Broken HTML

How spam filters actually decide where your email lands

Filters rank signals, not words. The hierarchy looks like this.
Sender reputation comes first. Your domain and IP have a score built from years of sending history, complaint rates, and bounce patterns. A warm, trusted domain can send phrases that would doom a fresh one.
Authentication matters next. SPF, DKIM, and DMARC tell the receiving server that you’re allowed to send from that domain and that the message wasn’t tampered with in transit. Miss any of these and you look suspicious before the filter reads a single word of your copy.
Engagement and complaints follow. Opens and replies help you. Spam reports and ignored messages hurt. Gmail’s threshold is a 0.10% complaint rate. Cross it consistently and your deliverability tanks.
Content comes last, not first. Filters lean on machine learning, and Validity notes that mailbox providers are now adding large-language-model detection on top. They’re looking for patterns: formatting tricks, phishing templates, phrases that cluster in junk mail. A single “limited-time offer” isn’t the problem. A message that reads like every other piece of spam is.

How to keep your emails out of spam

Start with authentication. Set up SPF, DKIM, and DMARC for every sending domain. If you skip this step, nothing else you do will matter.
Warm up new inboxes gradually. Sending 500 emails on day one from a cold domain is a fast way to get flagged. Ramp volume over weeks so providers see consistent, legitimate activity.
Keep your sending volume steady. Sudden spikes look like a compromised account or a spam operation. Stick to a balanced schedule your audience and your provider can both predict.
Honor unsubscribes immediately. If someone opts out and you keep emailing, you’re asking for a complaint.
Follow the law. According to the FTC’s CAN-SPAM compliance guide, the CAN-SPAM Act sets the rules for commercial email in the U.S. and covers all commercial messages. Each violating email is subject to penalties of up to $53,088. Include your physical address, make the unsubscribe easy, and process opt-outs within 10 business days.

Check your emails before you hit send

The best way to catch problems is before a prospect ever sees your email. Inside lemlist’s Deliverability Hub, Deliverability Boost runs a pre-send check on your copy, your technical setup, and your inbox placement signals. It shows you what’s at risk and why, so you can fix issues before you launch. You can also learn a lot from spam tests run against your live sequences.
Beyond that single check, lemlist rotates sending across multiple inboxes, caps volume per inbox automatically, sends messages within the recipient’s timezone, and verifies addresses to cut bounces. Every seat includes lemwarm for inbox warm-up.
The idea: deliverability isn’t something you fix after the damage is done. You build it into the workflow from the start. Check your emails before sending.

Keep your list clean

List hygiene is boring until it saves your domain.
Segment your list so you’re not blasting the same message to engaged buyers and cold leads who haven’t opened in six months. Remove invalid addresses before they hard-bounce. If you’re collecting new contacts, use double opt-in to confirm intent.
A smaller, verified list outperforms a bloated one every time.

Over to you

Spam trigger words are a footnote, not the headline. What actually keeps your emails out of spam is a clean domain, proper authentication, a healthy complaint rate, and sending behavior that looks legitimate. If you want the full pre-flight version, work through our email deliverability checklist before your next send.
If you want to see where your setup stands before your next campaign, run a pre-send check inside lemlist. You can start a 14-day free trial and test it on your own sequences.

FAQs

Do spam trigger words automatically send my email to spam?

No. A single word rarely decides where you land. Filters weigh sender reputation, authentication, and complaint rates first, then look at content patterns. A trusted domain can use words a brand-new one can’t. Clean up obvious triggers, but fix your setup first.

What are the most common spam trigger words to avoid?

The highest-risk categories are urgency (“act now,” “last chance”), money (“fast cash,” “double your income”), free and discount (“100% free,” “lowest price”), and hype (“miracle,” “guaranteed results”). Formatting flags like all-caps subject lines and excessive exclamation marks matter just as much as the words themselves.

How do I check if my email will land in spam before sending?

Run a pre-send check. lemlist’s Deliverability Boost reviews your copy, technical setup, and inbox placement signals before you launch, and tells you what to fix. You can also send test emails to your own seed accounts across Gmail and Outlook to see where they land.

Does using the word “free” always trigger spam filters?

No. Context decides. “Free” used naturally in a relevant message is fine. It becomes a problem when it’s stacked with other triggers, written in all caps, or paired with a misleading subject line. Filters flag the overall pattern, not one word in isolation.
RémiRémi Kokabi
Hi there, I’m Rémi, co-founder of the GTM Club powered by lemlist & Claap. If you believe Go-To-Market is the new moat in this AI-era, you should apply: https://www.thegtmclub.com/
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