About one in six legitimate emails never reaches the inbox. Average inbox placement sits at 83.1%, and the gap between providers is wide. Gmail delivers around 95%. Outlook is closer to 76%.
In my years working with brands on both their marketing and their transactional email, I’ve watched a few badly chosen words sink an otherwise legitimate message. The subject line is usually where it happens.
I’ve spent a lot of that time tracking how spam filtering has changed, from simple Bayesian scoring to the machine learning models Gmail runs today.
Below are 409 spam trigger words across 13 categories, the safer alternatives I reach for instead, and the factors that count for more than word choice.
- What Are Spam Trigger Words?
- 400+ Spam Trigger Words by Category
- Free and no-cost (35)
- Money, income and earnings (40)
- Guarantees and risk (25)
- Urgency and scarcity (40)
- Exaggeration and sensational claims (35)
- Sales and discount pressure (35)
- Finance, credit and debt (40)
- Prizes, winnings and giveaways (25)
- Health, weight and miracle cures (30)
- Adult and gambling (20)
- Marketing and spam-adjacent jargon (30)
- Shady offers and pressure (32)
- Work-from-home and opportunity (22)
- How Filters Actually Treat These Words
- Formatting Patterns That Trigger Filters
- Safer Alternatives
- How to Check Your Email for Spam Words
- What Matters More Than Word Choice
- Frequently Asked Questions
What Are Spam Trigger Words?
Spam trigger words are words and phrases that appear far more often in spam than in wanted mail. Filters learn that association from billions of messages. Stack enough of them into one email and the message scores higher on a spam scale. That’s when it gets diverted to junk.
They aren’t forbidden. They’re correlated with spam, which is a weaker and more useful thing to know.
400+ Spam Trigger Words by Category
Scan the categories that match how you write. Most senders only have a problem with two or three of them.
Free and no-cost (35)
The most over-used word in email marketing. Filters weight it heavily in subject lines.
free | absolutely free | completely free |
100% free | free access | free consultation |
free gift | free hosting | free info |
free installation | free investment | free leads |
free membership | free money | free offer |
free preview | free quote | free sample |
free trial | free website | free grant money |
free shipping | free bonus | free download |
free entry | free demo | free upgrade |
free report | free seminar | free evaluation |
free estimate | free gift card | free priority mail |
free DVD | free iPhone |
Money, income and earnings (40)
Income promises are the signature of advance-fee and MLM spam.
make money | make money fast | earn money |
earn extra cash | earn per week | extra income |
additional income | expect to earn | double your income |
double your cash | million dollars | millionaire |
money back | money making | cash bonus |
cash out | big bucks | easy money |
fast cash | instant cash | quick cash |
get paid | income from home | financial freedom |
financial independence | passive income | potential earnings |
pure profit | huge profit | increase sales |
increase traffic | monthly payment | cost per day |
save big money | unlimited earning potential | six figure |
get rich quick | money from home | cash advance |
profit |
Guarantees and risk (25)
Absolute promises read as unverifiable, which is what filters score.
guaranteed | 100% guaranteed | satisfaction guaranteed |
money back guarantee | risk free | no risk |
no obligation | no strings attached | no catch |
no questions asked | no purchase necessary | no fees |
no hidden costs | no hidden fees | no credit check |
no experience | no investment | no gimmick |
cancel at any time | full refund | unconditional |
iron clad | certified | promise you |
what are you waiting for |
Urgency and scarcity (40)
Manufactured deadlines are a pressure tactic, and filters know the pattern.
act now | apply now | buy now |
call now | click now | order now |
don't delay | don't hesitate | do it today |
deadline | expires | expires today |
final call | final hours | for a limited time |
get it now | hurry | hurry up |
immediate | instant | instantly |
last chance | limited number | limited offer |
limited supply | limited time | now only |
offer expires | once in a lifetime | only a few left |
right away | time limited | today only |
urgent | while supplies last | don't miss out |
now or never | time sensitive | ends soon |
act immediately |
Exaggeration and sensational claims (35)
Superlatives with nothing behind them look like clickbait.
amazing | amazing results | unbelievable |
incredible | incredible deal | mind blowing |
revolutionary | life changing | breakthrough |
phenomenal | miracle | secret |
secret formula | secret recipe | insane |
outrageous | jaw dropping | the best |
world's best | number one | unmatched |
unparalleled | unrivaled | sensational |
spectacular | stunning | astonishing |
remarkable | extraordinary | ultimate |
supreme | magic | magical |
you won't believe | shocking |
Sales and discount pressure (35)
Discount language is fine in moderation. Stacked, it reads as bulk promo.
special promotion | special offer | special deal |
exclusive deal | exclusive offer | discount |
big discount | huge discount | massive discount |
lowest price | best price | price protection |
prices slashed | half price | buy direct |
clearance | closeout | wholesale |
bargain | cheap | cheapest |
save up to | save money | save now |
deal of a lifetime | unbeatable offer | huge savings |
marked down | giveaway | order today |
shop now | subscribe now | join now |
best deal | slash your bills |
Finance, credit and debt (40)
Heavily abused by fraud, so these carry more weight than most categories.
accept credit cards | avoid bankruptcy | bad credit |
bank account | billing address | cards accepted |
cash loans | check or money order | collect child support |
consolidate debt | credit bureaus | credit card offers |
credit repair | debt free | eliminate debt |
eliminate bad credit | get out of debt | home mortgage |
investment decision | lower interest rate | lower monthly payment |
lower your mortgage rate | mortgage rates | pre approved |
pre qualified | refinance | refinance home |
social security number | stock alert | stock pick |
unsecured credit | unsecured debt | us dollars |
why pay more | wire transfer | crypto investment |
bitcoin investment | loan approval | interest free |
zero percent |
Prizes, winnings and giveaways (25)
Classic phishing language. Avoid these even when your offer is real.
you are a winner | you have been selected | congratulations |
claim your prize | prize | winner |
winning | jackpot | lottery |
sweepstakes | contest | cash prize |
gift certificate | you've won | claim now |
redeem now | reward | bonus |
exclusive access granted | selected specially | lucky winner |
spin to win | chosen specially | claim your reward |
unclaimed |
Health, weight and miracle cures (30)
Health claims attract the strictest filtering of any category.
lose weight | lose weight fast | weight loss |
fat burner | burn fat | no diet |
no exercise | miracle cure | cure baldness |
anti aging | reverse aging | stop snoring |
remove wrinkles | herbal | all natural |
medicine | pharmacy | prescription |
online pharmacy | no prescription needed | doctor approved |
clinically proven | supplement | enlargement |
valium | viagra | cialis |
xanax | diet pill | lose inches |
Adult and gambling (20)
Category-level blocks apply here regardless of how the message is written.
adult | xxx | hot singles |
meet singles | sexy | nude |
casino | online casino | gambling |
betting | poker | blackjack |
slots | roulette | bet now |
play now | win big | free spins |
dating tonight | meet me |
Marketing and spam-adjacent jargon (30)
Talking about email mechanics inside the email is itself a signal.
opt in | click here | click below |
click to remove | remove me | this isn't spam |
this is not spam | not spam | not junk |
bulk email | direct email | mass email |
mailing list | multi level marketing | mlm |
network marketing | marketing solutions | join millions |
join our list | one time mailing | sales driven |
leads | undisclosed recipient | member |
dear subscriber | per week | per month |
increase your sales | form | opt out |
Shady offers and pressure (32)
Generic salutations and legal boilerplate are hallmarks of scraped lists.
dear friend | dear sir | dear madam |
dear valued customer | hello friend | greetings |
as seen on | as seen on tv | compare rates |
cents on the dollar | copy accurately | for instant access |
for only | get started now | great offer |
important information regarding | in accordance with laws | information you requested |
new customers only | no age restrictions | one hundred percent free |
print out and fax | reserves the right | requires initial investment |
stop further distribution | take action now | important notice |
good news | special invitation | confidential |
strictly confidential | urgent response needed |
Work-from-home and opportunity (22)
Long associated with recruitment scams and pyramid schemes.
work from home | work at home | be your own boss |
home based business | home employment | online biz opportunity |
opportunity | part time | full time |
no experience needed | hiring now | immediate start |
apply today | job alert | easy work |
flexible hours | quit your job | start earning today |
dream job | career opportunity | recruiting now |
earn from home |
How Filters Actually Treat These Words
Worth understanding, because it tells you how much to care.
Gmail doesn’t match a word list. It scores messages with machine learning models trained on enormous volumes of mail. Content is weighed alongside sender reputation, authentication, and how recipients treated your past messages. Google’s own sender guidelines say nothing about forbidden vocabulary. They’re almost entirely about authentication, rate limits and complaint rates.
Misspelling won’t save you. Writing fr33 or F R E E used to slip past filters. Google now runs a text vectorizer built to be resilient to exactly that, covering typos, homoglyphs and leetspeak substitutions. Obfuscation reads as intent to evade, which is worse than the original word.
SpamAssassin scores rules, not vocabulary. Apache SpamAssassin runs a message through hundreds of rules and adds up the score. Body rules are regular expressions, and most individual matches carry a fraction of a point. What pushes a message over the threshold is density and combination. “Free!!” in the subject, plus “act now”, plus a link shortener, stack into a real score. Any one of them alone does not.
So the practical rule is about concentration. Two or three of these words across a normal email is unremarkable. Eight in a short promotional message, in the subject line and in bold, is a different signal.
Formatting Patterns That Trigger Filters
Word choice isn’t the only content signal. These patterns are scored too, and several outweigh any single word.
- ALL CAPS subject lines
- Multiple exclamation marks (!!!)
- Dollar signs used as emphasis ($$$)
- Excessive percentage claims (100%, #1)
- Red or oversized fonts
- Heavy bold and underline
- Emoji stacked in the subject line
- Deliberate misspellings (fr33, m0ney)
- Spaces between letters (F R E E)
- Unicode look-alike characters
- Mismatched display URL and link target
- Bare link shorteners
- Image-only emails with no text
- Attachment-only messages
The last two matter most. An image-only email gives a filter nothing to read. And a mismatch between link text and destination is a phishing hallmark.
Heavy HTML causes a related problem. Once a message gets large enough, Gmail truncates it, which is inbox clipping.
Safer Alternatives
Most spam words have a plain-English replacement that says more:
| Instead of | Write |
|---|---|
| Free | Complimentary, included, no charge |
| Act now | Available until [date] |
| Limited time | Open through Friday |
| Amazing deal | Worth a look |
| Guaranteed | Backed by our 30-day return policy |
| Click here | See the full breakdown |
| Don’t miss out | Here’s what’s included |
| Make money fast | Typical results in the first quarter |
| Risk free | Cancel any time from your dashboard |
| Congratulations, you’ve won | Your entry is confirmed |
| Dear friend | Hi [first name] |
| Urgent | Time-sensitive: renewal on [date] |
The pattern is to replace a claim with a fact. “Guaranteed” is unverifiable. “Backed by our 30-day return policy” is checkable, so it reads as credible to a person and to a filter.
How to Check Your Email for Spam Words
Run it through a spam tester. Send your draft to mail-tester.com and read the report. It returns a score out of 10 plus the specific rules you tripped. The rule names are the useful part.
Read the report, not the score. A 7/10 caused by a missing DKIM signature needs a completely different fix than a 7/10 caused by subject-line wording. The score alone won’t tell you which.
Test the subject line separately. Subject text is scored as part of the body by most filters, and it carries more weight per word. If you cut spam words from one place, cut them here.
Send yourself a real copy. Seed a Gmail, Outlook and Yahoo address and look at where the message lands. That’s the only test that reflects reputation, and reputation outweighs wording.
What Matters More Than Word Choice
If your mail is going to spam, wording is rarely the main cause. These carry more weight.
Authentication. SPF, DKIM and DMARC are the baseline. Without them, clean copy won’t save you.
Complaint rate. Recipients marking you as spam is the strongest negative signal there is. Our guide on reducing spam complaints covers the thresholds to stay under.
List quality. Sending to addresses that never opted in produces complaints and bounces, and can land you on an email blacklist.
Engagement history. Providers watch whether people open, reply and keep your mail. A sender with good history gets latitude on wording that a cold domain does not. Google Postmaster Tools shows you how Gmail rates yours.
Text-to-image balance. An email that’s one large image has no text to score and looks evasive.
If messages are already landing in junk, work through why emails go to spam before rewriting copy.
Frequently Asked Questions
What are some spam words?
The most common ones cluster around free offers, money claims, urgency, and guarantees. Words like “free,” “act now,” “guaranteed,” “risk free,” “make money fast” and “congratulations” show up in nearly every spam-word list. The full categorized list of 409 is above.
What are some examples of spam?
Advance-fee fraud is the classic one, like the inheritance or lottery email. Then there’s phishing that imitates a bank or a delivery company. Fake pharmacy and supplement offers. Work-from-home recruitment scams. And bulk promotional mail sent to a list that never opted in.
The last one matters most for legitimate senders. Mail can be flagged as spam purely because recipients never asked for it. How the copy is written won’t change that.
How do I check for spam words?
Send the message to a spam-testing service and read the report. Free options include mail-tester.com and the spam-word checkers run by several email vendors. They return a score plus the specific rules your message tripped, which is more useful than the score alone.
What is spam in slang?
Outside of email, “spam” means posting the same thing repeatedly, like sending a chat message over and over. The email meaning came first. It traces back to a 1970 Monty Python sketch where the word is repeated until it drowns out everything else.
Will one spam word send my email to junk?
Almost never. Filters score patterns rather than single words. One instance of “free” in a normal message is unlikely to matter. “FREE!!” in the subject, three more in the body, and a link shortener together will.
Do spam trigger words still matter in 2026?
Less than they used to, and less than most articles imply. Authentication, engagement history and list quality carry far more weight. Word choice is a tiebreaker, not the main event. It is worth cleaning up because it is the cheapest of those factors to fix.
That’s it! Now you know which spam trigger words to avoid in your emails.
Next, would you like to understand the filters themselves? Take a look at our guide to how AI spam filters work for the mechanics behind the scoring.
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