405 Method not allowed when using php email form - Help - Caddy Community
PHP Exercise: Email validation - w3resource
Sending and Validating Emails in PHP: Using PHPMailer and filter_var() - CodingTXT
PHP Email Contact Form | Mailtrap
GitHub - stymiee/email-validator: The Email Validator library builds upon PHP's built in `filter_var($emailAddress, FILTER_VALIDATE_EMAIL);` by adding a default MX record check. It also offers additional validation against disposable email addresses ...
How to Send Emails with PHP Mail() Function and PHP Mailer