If someone has told you that you have been sending out a virus, it may not be from you. Here is the explanation.
This may help.
Thanks to Ronnie Marshall for this info...
June 14, 2002
Hey everyone, just to let you know, some of our friends have the W32KlezH@mm virus in thier computer system which is randomly using an address to send to uninfected computers. I would suggest you all go to www.symantec.com and get and run the Virus Removal Tool. It will remove the virus, if you have it, or tell you if you do not. Also, it is important to keep your Virus Definitions up-to-date daily to avoid encountering a virus. Following is an excerpt a friend sent me explaining how this virus works to make itself "imposter" one of your email addresses:
Some variants of this worm use a technique known as "spoofing." If so, the worm randomly selects an address that it finds on an infected computer. It uses this address as the "From" address that it uses when it performs its mass-mailing routine. Numerous cases have been reported in which users of uninfected computers received complaints that they sent an infected message to someone else.
For example, Linda Soandso is using a computer that is infected with W32.Klez.E@mm; Linda is not using an antivirus program or does not have current virus definitions. When W32.Klez.gen@mm performs its emailing routine, it finds the email address of Harold Whatshisname. It inserts Harold's email address into the "From" portion of an infected message that it then sends to Janet Target. Janet then contacts Harold and complains that he sent her an infected message, but when Harold scans his computer, His AntiVirus program does not find anything--as would be expected--because his computer is not infected
This is Ken Oxenrider again....
There is only one thing I know of you can do for this particular one. Get a good anti-virus program that will intercept them. You probably already have one. If so, make sure you have your definitions downloaded, installed, and up to date. If you think you have it or might have it, download the fix from the url https://www.symantec.com/avcenter/venc/data/w32.klez.removal.tool.html and run it.
If you want to take the time and trouble, you can load the email message from the email dir using a text editor and look at the entire hidden header and see where it REALLY came from and let them know they have it and are spreading it. Most people won't go to the trouble to do this though I'm afraid.
Here is more in depth info on the ins and outs of junk mail that will also help you track down who sent you a virus if you want to take the time.