What potential issues could arise from sending emails with incorrect headers in PHP?
Sending emails with incorrect headers in PHP can lead to emails being marked as spam or not being delivered at all. To ensure proper delivery, it is important to include necessary headers such as From, To, Subject, and MIME type in the email. Make sure to validate and sanitize user input to prevent any malicious code injection.
// Correct way to send an email with proper headers
$to = "recipient@example.com";
$subject = "Test Email";
$message = "This is a test email.";
$headers = "From: sender@example.com\r\n";
$headers .= "Reply-To: sender@example.com\r\n";
$headers .= "MIME-Version: 1.0\r\n";
$headers .= "Content-Type: text/html; charset=ISO-8859-1\r\n";
mail($to, $subject, $message, $headers);