Hello,

Thank you for your question. There is nothing that requires a mail server to respond to a request for a delivery receipt. The option to respond is optional in MDaemon. If the server that you are sending to is an MDaemon server, make sure you have it configured to respond to the request. You can check this by going to Setup / preferences / headers, make sure ‘Respond to all ’Return-Receipt-To’ requests is enabled.

I’d also recommend checking the email to make sure the client you are using is actually including the header. You can do this by freezing the local or remote queues in MDaemon, sending a test message and then opening the message in Notepad. Look for a "Return-Receipt-To’ header in the message.

If the mail client is including the header, then either the receiving server is not responding to it, or the receiving server is having problems delivering the message back to your server.

If the receiving server is not responding to the request, there isn’t anything you can do about it, unless you have control of the receiving server.

You can check your inbound SMTP logs for a failed delivery attempt from the receiving server to see if delivery is failing.

If you’d like further assistance or you have additional questions, please reach out to our support team. All of our support options are available at http://www.altn.com/support/.

Thanks,
Arron