spam accusation

I recently had two e mails returned, undelivered. Hotmail added some obscure information that reported me as being identified as distributing spam. The e mails were identical copies of one that I had received the day before. How do I handle this false accusation?

 

I used to work for an ISP with this problem. What happened is that hotmail had blacklisted our server as a provider of spam. They did this without reason and refused to listen to our complaints. I am afraid the only solution we found was to switch to gmail.

 

Thank to both Halo and Senlis for their kind assistance. I am in the happy position where I rarely receive spam, and certainly would never consider disseminating it. I don't use hotmail myself, but the two recipients do. I have since sent a couple of e-mails to the same people without any problems. Thank you again.

 

I've seen "undeliverable mail" that comes back to my email account, and I know I didn't send them...my guess is someone's just using random emails to put in the "from" field.