Free Email Spam Checker & Subject Line Tester
Paste your email — subject line, preheader and body — and get an instant score out of 100, a content spam-risk check and a live inbox preview, before you hit send. See what to fix for free. Students unlock the full fix-list and a subject-line idea generator.
Want to master email & digital marketing?
This tool is from Digital Market Academy, Bangalore. We run small-batch (max 6), hands-on classroom courses with placement support, rated 5.0 by our students.
See the classroom courseFrequently asked questions
Is this email spam checker really free?
Yes. Checking your email — subject line, preheader, body, spam-risk score and inbox preview — is completely free, with no signup. DMA students unlock the full step-by-step fix-list and the subject-line idea generator using their student code.
Can this tool guarantee my email reaches the inbox?
No tool can. This checker analyses your email content for spam signals (spam-trigger words, ALL-CAPS, too many exclamation marks or links, a missing preheader). True inbox placement also depends on your sender reputation, email authentication (SPF, DKIM, DMARC), list hygiene and engagement — things a browser tool can't see. Treat the spam-risk score as a content-quality indicator, not a delivery guarantee.
What is preheader / preview text?
The preheader (preview text) is the short grey line shown after the subject in most inboxes like Gmail and Apple Mail. Many senders leave it blank, which wastes valuable space. A good preheader is about 40–100 characters and complements the subject rather than repeating it.
How long should my subject line be?
Aim for roughly 28–50 characters. Mobile inboxes often cut off at around 30–40 characters, so put the most important words first. The inbox preview shows how your subject and preheader look on mobile and desktop, with the cut-off points marked.
Is my email content private?
Yes. Everything you paste is processed entirely inside your own browser. Your email content is never uploaded, stored, or seen by us. Only if you choose to submit your contact details (to hear about unlocking) do those details reach us.
Why does my email land in spam or promotions?
Common content causes: spam-trigger words (free, winner, guaranteed, act now), ALL CAPS, too many exclamation marks, too many links or images vs text, a misleading subject, and no preheader. Beyond content, poor sender reputation and missing authentication (SPF, DKIM, DMARC) are major causes. This tool flags the content issues you can fix yourself.
🔒 Privacy: everything you paste here is processed entirely inside your own browser. Your email content is never uploaded, stored, or seen by us. Only if you choose to submit your contact details (to hear about unlocking) do those details reach us.
