I've just received 91 bounced emails with my main email address as the sender. They were automated messages saying that the email sent from my address couldn't be delivered.

Unfortunately the message was promoting a child porn website.

I'm sure that many messages have been delivered so now I expect a flood of complaints.

Is there anything I can do as damage limitation? Any official sites I can report this to?

The dns record of the domain shows a US based company hosted with Verio. Is it worth emailing them?

Any suggestions?