Spam email sent out

A few days ago, there was a ton of emails sent out by spammers - all those emails appear to come from an unknown email address with my domainname - stocknews9271@udaysasi.com or something like that. Most of those emails got blocked by the addressees anti-spam softwares and got bounced back. Since that email doesnt actually exist, they ended up in my Inbox as I have activated "Catch All" feature in Yahoo Domains. (From Yahoo Domains site : With the "catch-all" feature, any messages sent to an address at your domain name that does not exist will be redirected to your Yahoo! Mail account). Thus my Inbox got flooded with over 1000 emails per day for 2 days until I realised I can turn off that feature. If someone is checking this website with regards to those emails, I am glad I blogged this.. Looks like there is no place to hide from spammers.