Illustration showing PHP mail() errors, SPF/DKIM/DMARC setup, Gmail spam rejection, and SMTP solution using PHPMailer.

Why PHP mail() Is Not Working and How to Fix Email Delivery Issues

Many developers run into problems when using PHP’s built‑in mail() function. Common complaints include:

  • PHP mail() not working
  • PHP mail success but does not deliver the email
  • Not getting email to my Gmail account with PHP mail()
  • Not getting email with the simple PHP mail() function

These issues are widespread because mail() It is very basic and lacks modern authentication. Let’s explore why this happens and how to fix it.

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