Email Validation Tool That Flags Excessive JavaScript in Email Body
Find and fix email body scripts that harm deliverability. Use MailTester’s real-time API and inbox placement tests to catch issues before sending.
Why Does JavaScript in Email Bodies Break Deliverability?
You click a link in an email, and suddenly a script runs—prompting a popup, redirecting you, or even loading a form. Sounds useful, right? Not in email. Most email clients silently block any JavaScript because it's a vector for malware and tracking.
Even a harmless script—no malicious intent—can get flagged as suspicious. Clients like Gmail, Outlook, and Apple Mail strip out
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