Spam being sent from my email address
I got an email this morning alerting me to the fact my yahoo email address is sending out spam and viruses.
I have checked my sent folder and it doesn't appear to have come direct from my email account, and on checking message headers it seems to be coming from a user in the US who is spoofing my email address.
I have run malware and virus checks, and both came back negative, and I have also beein into my yahoo acount and changed all of the security settings and passwords etc..
Is there much else that I can do to stop this?