Does your email contain phrasing that smells like spam?
Paste the subject or body of your message. The text stays in your browser.
This is not a spam filter. The list is in-house, built from phrasing that sender guidelines (Google, Mailchimp, Brevo, FTC) cite as deceptive or promotional. Gmail, Outlook and SpamAssassin do not rely on a fixed word list but on sender reputation, authentication, complaints and engagement. A highlighted word does not send a message to spam, and an unhighlighted text does not escape it.
When to use this checker
Just before sending a campaign, to review the subject and first message, or when your emails land in junk and you look for what may make them look suspicious.
It mainly spots a mass-advertising tone. A prospecting message that works reads like a message written to one person, not a promotion.
How to read the result
Each highlight has one colour per category, with the explanation and a way to rephrase. Form signals (capitals, exclamation marks, shortened links) appear below.
A highlight is an invitation to reread, not an error: "free" is legitimate if your offer really is. Remove what does not serve the recipient, keep what is true and specific.
Frequently asked questions
Is my text sent anywhere?
No. The analysis runs in your browser; nothing is sent to Fluenzr or kept.
Are these the words Gmail or Outlook use?
No, and nobody publishes those filters' lists. They rely mostly on sender reputation, authentication and recipients' reactions. This list is a writing guide.
Should I ban every highlighted word?
No. Avoid clichés and promises you cannot prove. A specific, true word in a relevant message is not a problem.
What weighs most on deliverability?
Domain authentication (SPF, DKIM, DMARC), list quality, gradual volume and complaint rate. Content comes after: see the compliance checker.
These tools are free and need no account. To send your sequences from your own mailboxes, FluenzR offers a free account with 14 days of Pro included. Create a free account
The other free tools
- Gmail, Yahoo, Outlook compliance checkerCheck your domain's SPF, DKIM and DMARC, then go through the 2024-2025 sender rules checklist.
- Sending volume calculatorHow many emails a day without damaging your domain, and how to ramp up week after week.
- Cost comparison calculatorYour yearly budget at lemlist, Instantly, Smartlead and others, compared with FluenzR Pro at 19 euros a month.
- GDPR notice generatorInformation notice, data source and objection wording for B2B prospecting in France, ready to copy.
- AI email subject line generatorDescribe your message: six short subject line ideas, free of spam wording, ready to copy.