Why is it recommended to include the From: and Reply-To: fields in a mail header when sending emails with PHP?

Including the From: and Reply-To: fields in a mail header when sending emails with PHP is recommended because it helps ensure that the email is properly delivered and that any replies are directed to the correct email address. By specifying these fields, you can control the sender and reply-to addresses, which can help prevent your emails from being marked as spam. Additionally, it provides a better user experience for recipients who may want to reply to your email. 

$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";

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

Keywords

PHP mail header From Reply-To email sending

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