Why Isn’t the PHP Mail Function Sending Mail?

Sending emails using PHP's mail() function can be deceptively simple, but issues often arise due to misconfigurations, particularly with the Postfix mail transfer agent. Postfix, a widely-used, open-source software on Unix-like systems, must be correctly configured for PHP mail() to function properly. Common problems include incorrect setup of Postfix parameters, such as the critical 'myhostname' variable, which defines the email's sending domain. It's crucial to ensure Postfix is installed and configured, and to check for simple errors like typos in email addresses. Testing Postfix's functionality with a PHP script can help diagnose issues. If problems persist, further troubleshooting resources, like those found on StackOverflow, may be necessary.

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