How can one troubleshoot and debug issues with PHP mail function not delivering emails to recipients?

The PHP mail function may not be delivering emails due to various reasons such as misconfigured mail server settings, spam filters blocking the emails, or incorrect parameters in the mail function. To troubleshoot and debug this issue, you can check the server's mail logs for any errors, ensure that the 'From' address is a valid email address, and test sending emails to different email addresses. 

// Example PHP code snippet to troubleshoot PHP mail function not delivering emails

// Set the recipient email address
$to = "recipient@example.com";

// Set the subject of the email
$subject = "Test Email";

// Set the message body of the email
$message = "This is a test email.";

// Set the additional mail headers
$headers = "From: sender@example.com";

// Attempt to send the email
if (mail($to, $subject, $message, $headers)) {
    echo "Email sent successfully.";
} else {
    echo "Failed to send email.";
}

Keywords

PHP mail function troubleshooting debugging email delivery recipients

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