What are some common issues with the mail() function in PHP, such as receiving a TRUE response but the email not being delivered?

One common issue with the mail() function in PHP is that even though it may return TRUE (indicating that the email was accepted for delivery by the mail server), the email may not actually be delivered to the recipient's inbox. This can happen due to various reasons such as misconfigured mail server settings, spam filters blocking the email, or the email being marked as spam by the recipient's email provider. To troubleshoot this issue, you can check the email server logs for any errors, ensure that the sender email address is valid and not on any blacklist, and consider using a third-party email delivery service like SendGrid or Amazon SES for more reliable email delivery. 

$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email from PHP's mail() function.";
$headers = "From: sender@example.com";

if (mail($to, $subject, $message, $headers)) {
    echo "Email sent successfully.";
} else {
    echo "Email delivery failed.";
}

Keywords

mail function PHP TRUE response email delivery troubleshooting

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