If you're trying to figure out whether a recipient read your message, there doesn't appear to be any way to guarantee it as long as you're using different mail servers. The recipient can disable a request for a return receipt. All of the tools and services for email tracking appear to rely upon the recipient not being technically knowledgeable enough to protect their privacy, that it's too much of a hassle for them to take the necessary precautions, or that they don't care.

http://kb.mozillazine.org/Figuring_out_whether_the_recipient_read_your_message

I only want to know if it was delivered; not if it was read.

But the vast majority of servers don't have the DSN feature enabled.

The only time I have seen it work, as christ1 hinted at in his mention of "using different mail servers", is with messages between my wife and myself, using accounts on the same domain and therefore the same server.