Php Email Form Validation - V3.1 Exploit Info

Attackers use newline characters ( \r\n or %0A%0D ) to "break out" of the intended field and insert their own SMTP headers.

The "PHP email form validation - V3.1 exploit" serves as a reminder that simple forms can have complex consequences. By moving away from the native mail() function and implementing rigorous server-side validation, you can protect your server from being blacklisted and your data from being compromised. If you'd like to secure your specific script: (remove sensitive URLs) Specify your PHP version Mention any mail libraries you are currently using php email form validation - v3.1 exploit

Use str_replace() to strip \r and \n from any input used in email headers. Attackers use newline characters ( \r\n or %0A%0D

I can then provide a of your code.