Bad emails slip through your forms every day. Here's what that costs you.
Users mistype emails like "gmal.com" or "yahooo.com" and lose access to their accounts.
Users sign up with throwaway emails to exploit free trials, then never return.
Bots and bad actors fill your forms with junk emails that pollute your database.
People who can't receive your emails can't complete purchases or verify accounts.
SendSure's widget validates emails in real-time as users type. Invalid emails are blocked before they ever reach your server.
See how validation protects different form types
Stop bad data before it enters your system
Good list hygiene starts at the source. Never let an invalid email into your database in the first place.
Detect and block disposable, temporary, and role-based emails that often signal fraud or abuse.
Higher-quality lists mean better open rates, fewer bounces, and stronger sender reputation.
Avoid being blacklisted by ISPs. Clean lists protect your sender reputation and domain health.
Don't pay your email provider to send to addresses that don't exist. Every credit counts.
Configure validation rules, styling, and messages to match your brand and business needs.
Wherever you collect emails, SendSure can validate them
Ensure new accounts have valid emails for verification and password recovery.
Build a clean subscriber list from day one with validated email addresses.
Validate customer emails before purchase to ensure order confirmations are delivered.
Capture quality leads with valid contact information for your sales team.
Ensure customer inquiries come from reachable email addresses you can respond to.
Verify student emails for online courses to deliver materials and certificates.
Adding SendSure validation to your forms takes just 2 simple steps. No backend changes, no complex configuration.
Include our lightweight JavaScript file (8kb gzipped) in your page.
Add a data attribute to your email input. That's it—validation is live!
<!-- Step 1: Add the script -->
<script src="https://cdn.sendsure.co/widget.js"
data-key="YOUR_API_KEY"></script>
<!-- Step 2: Add the attribute -->
<input type="email"
data-sendsure="validate"
placeholder="Enter your email">
<!-- Optional: Customize the experience -->
<script>
SendSure.configure({
blockDisposable: true,
blockRoleBased: false,
showSuccessMessage: true
});
</script>Real-time validation in four simple steps
As the user enters their email address, the widget detects input changes.
SendSure validates the email in real-time using 18+ verification checks.
The user sees immediate feedback—green for valid, red for invalid.
Invalid emails block form submission. Only clean data reaches your server.
The widget communicates securely with SendSure's API infrastructure. Your users' data is encrypted in transit and never stored.
Choose the solution that best fits your workflow.