xF2 Add-on [Free] UserCheck - Block Disposable Emails 1.0.1

Hi everyone,​

We're excited to share our first XenForo add-on with the community!

UserCheck blocks users from registering with disposable/temporary email addresses. It uses the UserCheck.com API to validate email addresses in real-time during registration, helping to reduce spam accounts and improve the quality of your member base.

Automatic Detection - Validates against a daily updated database of disposable emails and domains
Two Validation Modes - Choose between full email validation or domain-only (for privacy)
Free Tier Available - 1,000 API validations per month at no cost
Easy Setup - Auto-redirects to settings after installation
Clean Integration - Extends XenForo's existing validation with no core modifications
Fail-Safe Design - If the API is down, registrations continue normally

1. User attempts to register with an email address
2. The add-on checks the email/domain with the UserCheck API
3. If it's a disposable email, registration is blocked with a friendly error message
4. If the API is unavailable, registration proceeds normally (fail-open design)

1. Download the add-on
2. Upload to your XenForo installation
3. Install via Admin CP
4. Get your free API key from app.usercheck.com
5. Configure and you're done!

• The add-on itself is completely free
• UserCheck API offers 1,000 free requests/month
• Paid plans available for larger forums

• XenForo 2.3.0+
• PHP 7.4+