An EMAIL that says "HEY" in the subject line

I Didn't know of the problem until the yahoo mailer demon started sending all these email back to me that had "Hey" in the subject line. I thought that had been deleted two days ago when I received a warning not to open an email. I deleted it and thought it was done. I must have picked it up again some where else. I installed Clam antivirus but can't find it now to use it..

ProblemType: Bug
DistroRelease: Ubuntu 11.04
Package: software-center 4.0.7
ProcVersionSignature: Ubuntu 2.6.38-14.58-generic 2.6.38.8
Uname: Linux 2.6.38-14-generic i686
Architecture: i386
Date: Wed May 9 03:14:47 2012
InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release i386 (20110427)
PackageArchitecture: all
ProcEnviron:
 LANGUAGE=en_US:en
 LANG=en_US.UTF-8
 SHELL=/bin/bash
SourcePackage: software-center
UpgradeStatus: Upgraded to natty on 2012-05-02 (7 days ago)