Mailbox viruses and errors

I'm getting random e-mails attached with viruses form people on my mailing list but they did not send them. I have no virus on my computer or server. I'm using an Exchange sever to send and receive e-mail. Also when I reply an e-mail I get back an error stating that there is no mailbox for an e-mail address that doesn't match the reply address. For example, emails me but error comes back no mailbox for Does any have any leads on what might be the problem?
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Sounds like spoofed email - bit more info on it here,
Spoofed/Forged Email

Deb :))
And here:
Email spoofing - Who really sent that email?

Many many viruses use the technique to distribute themselves unfortunately. There's very little you can do other than to ensure that you have good, fully updating virus protection software to prevent infection and to prevent you from inadvertently acting as a distributor,

Deb :))

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IT-admin04Author Commented:
Great info! thanks
Ur welcome :))
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