Email validation is crucial to avoid fake or malformed emails, improve email deliverability, and enhance the user experience by catching typos early.
PHP offers simple and reliable email validation through built-in functions and filters like filter_var() and regular expressions.
Best practices include using filter_var() for validation, optionally checking MX records for domain validity, and providing clear feedback to users about invalid emails.
Implementing email validation in both client-side (JavaScript) and server-side (PHP) is recommended to enhance lead quality and user experience.