How can one ensure that emails sent using the mail() function in PHP are not rejected by AOL or other email providers due to syntax errors?

To ensure that emails sent using the mail() function in PHP are not rejected by AOL or other email providers due to syntax errors, it is important to properly format the email headers. This includes setting the "From" address, "Reply-To" address, and ensuring that the headers are correctly formatted with line breaks (\r\n). Additionally, it is recommended to use a proper email library like PHPMailer for sending emails, as it handles these formatting issues automatically. 

<?php
$to = 'recipient@example.com';
$subject = 'Test Email';
$message = 'This is a test email';
$headers = 'From: sender@example.com' . "\r\n" .
    'Reply-To: sender@example.com' . "\r\n" .
    'X-Mailer: PHP/' . phpversion();

mail($to, $subject, $message, $headers);
?>

Keywords

mail function syntax errors email rejection AOL email providers

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