What are common reasons for the mail() function in PHP not working as expected?

Common reasons for the mail() function in PHP not working as expected include incorrect server configurations, spam filters blocking the email, or incorrect parameters being passed to the function. To solve this issue, ensure that your server is properly configured to send emails, check your spam filters to see if the emails are being blocked, and double-check that the parameters passed to the mail() function are correct.

// Example code snippet to send an email using the mail() function
$to = "recipient@example.com";
$subject = "Test email";
$message = "This is a test email sent using the mail() function in PHP.";
$headers = "From: sender@example.com";

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