Free Email Spam Checker
Analyze your subject line and email body to detect spam triggers and improve email deliverability.
Runs entirely in your browser — nothing is uploaded.
0 words
Your results appear here
Paste an email and hit Analyze to get a spam score from 0 to 100 plus a fix for every issue detected.
What actually decides if your email lands in the inbox
Spam filtering is a scoring system, not a single switch. Here is what moves the needle.
How spam filters work
Providers score every message on authentication (SPF, DKIM, DMARC), sender reputation, recipient engagement and content signals. Each risky signal adds points; cross the threshold and the message goes to spam. Content is the part you fully control before hitting send.
Common spam trigger words
Words like free, act now, limited time, urgent, winner, congratulations, cash, cheap spike scores — especially in the subject line or combined with shouting capitals and repeated punctuation.
How to improve inbox placement
Authenticate your domain, keep lists clean, send at a steady volume, remove hard bounces, and write emails people reply to. Engagement is the strongest long-term signal you have.
Best practices for business email
One clear purpose per email, a specific subject, real personalization, plain sentence case, 80–200 words, one link and one obvious next step. Skip images-only emails and link shorteners.
How Mailvern helps improve deliverability
Mailvern sends from your own Gmail account, so you inherit your existing domain reputation instead of a shared bulk-sender IP. Conditional sending means only the rows that actually need an email get one — smaller, more relevant sends with higher engagement. Merge fields personalize every message from your sheet, and open tracking shows which campaigns are landing.
Email Spam Checker questions
How does the Email Spam Checker work?
It analyzes your subject line and email body in your browser using weighted rules — capitalization, punctuation, trigger words, link density, personalization, readability and length — and returns a spam score from 0 to 100 with fixes for every issue found.
Is my email content uploaded anywhere?
No. The analysis runs entirely in your browser. Nothing is sent to a server, stored, or shared.
What is a good spam score?
90 and above is excellent, 75–89 is good, 50–74 needs improvement, and below 50 means your email is at high risk of landing in spam.
Does a perfect score guarantee inbox placement?
No tool can guarantee inbox placement. Content is only one factor — sender reputation, SPF, DKIM, DMARC, list quality and engagement all matter too.
Is the Email Spam Checker free?
Yes, it is completely free and requires no account.
Related free email tools
More deliverability tools are on the way.
Email Subject Line Checker
Coming soonScore subject lines for length, clarity and open rate.
Email Signature Generator
Coming soonBuild a clean, professional signature for Gmail.
SPF Checker
Coming soonValidate the SPF record for your sending domain.
DKIM Checker
Coming soonConfirm your DKIM signature is published correctly.
DMARC Checker
Coming soonReview your DMARC policy and alignment.
Email Header Analyzer
Coming soonTrace delivery hops and authentication results.
Ready to send better emails?
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