Delivery Status Notification?

[Lemon Jelly]

I started to get some spam on one of my domain emails so I setup BoxTrapper so that when I get sent an email an auto reply is sent which asks the user to reply to the message, just reply nothing more, once they have done that I get the email.

I just got an email from [email protected] (Base is my email name) which says....

This is an automatically generated Delivery Status Notification.

Delivery to the following recipients failed.

[email protected]





Reporting-MTA: dns;mail.otxresearch.com
Received-From-MTA: dns;mail1.otxresearch.com
Arrival-Date: Sat, 10 Nov 2007 06:18:08 -0800
Content-Type: text/plain

Final-Recipient: rfc822;[email protected]
Action: failed
Status: 5.1.1

Then under that there is some HTML with links and images for Viagra. What is actually going on? Is it a human that has sent this or have spam bots got better?