People who received emails with virus

I hope people that received emails with a virus attached have not had problems.  In the last 36 hours, I have had many returned emails because people had changed their emails so I know they did not receive them.  Three people have asked if I sent them - which i did not. 

The culprits hijacked three of my email accounts and sent out a lot of emails as if they were from me.  Shame on them.  I