Delivery Status Notification (DSN) is a function of the MTA. There are two different kinds: positive and negative delivery status notifications. Negative delivery status notifications have been available for a long time:
Sorry, your message could not be delivered to:... and hopefully some meaningful explanation. Depending on some implementation stuff, you probably get your complete message back.
You get a FAILURE when the e-mail couldn't be delivered.
I get these quite a bit - and when I look at it, it is on one of my domains that I have had for years and usually it says something like [email protected]. Of course there is no Dave here (only Corey ) and since it is a catch-all, it catches the NDR.
Basically people are using your email address as the sender. If you can, make sure that they are not using your email server (this could potentially get you on some spam lists).
As far as I know - there is not much of anything that can be done. I can send email from scripts saying it is from just about anyone. As long as it is not coming from your mail server / IP, that is what really matters
they do check the spam list of most common RBL's and give you the result. Else another method is to sent out messages to common accounts like the AOL's or similar guys who keep regular check on spam database, if you are blocked then you should receive the correspondence.