How can I alter drupal_mail function to add Reply-To in the headers?

Question

I am using drupal_mail function to send emails from a website. My requirement is mail which are sent from website should have from address as noreply@website.com and replyto address should be testing@website.com.

To achieve this i followed some below posts:

Post1

Post2

From addres is working fine but Reply-To is not setting for the mails. Correct me if am doing anything wrong. Below is the code:

function module_mail_alter(&$message) { 
  $message['headers']['From'] = $message['headers']['Sender'] = $message['headers']['Return-Path'] = 'noreply@website.com';

  $message['headers']['Reply-To'] = 'testing@website.com';
}

Answer 1

Just take a look at DefaultMailSystem and Ensure that the Return-Path is set.