Mailcheck

Mailcheck is a JavaScript library developed by Mailgun (now Kickbox) that helps reduce typos in email addresses through suggestion-based validation. It compares entered email domains against a list of popular providers and suggests corrections when it detects likely typos. For example, if a user types "user@gmial.com", Mailcheck will suggest "user@gmail.com" as a correction. The library works by calculating string distance between the entered domain and known email providers to identify probable mistakes. Mailcheck improves form completion rates and reduces bounced emails by catching errors before submission. It's lightweight, easy to integrate, and customizable with additional domains specific to your user base. The library is commonly used in registration forms, newsletter signups, and checkout processes to improve data quality.