Dear Sender,
I recently received an email from you warning me of a virus. I have written this letter in reply to your email in hopes of informing you about such emails. You may or may not have known that the email you sent is a hoax. I appreciate your concern and understand that you sent the email with good intention, but I hope this email will help you understand why it is better to delete those emails sometimes rather then forward them to others.
In the future, if you receive an email with such claims, it is better to first research the email and its contents on the web. This will help you determine the severity of the email and whether it is truly a hoax or not. There are many sites on the Internet where such information can be found. Hoaxbusters is a site dedicated to debunking hoaxes such as the email you sent. Vmyths is another site that you can visit to learn more about viruses and hoaxes. Once you learn about the warning signs of hoaxes, you will be able to distinguish these types of emails and know to delete them in the future rather than sending them to others.
Most of the time, these hoax letters are simply annoying and not very dangerous. They do nothing more than provide clutter in our inboxes. Sometimes though, a hoax email is actually used as a carrier of a true virus. Again, in this case, it is best not to send the email, which will only spread the virus to others.
Thanks again for your willingness to become informed on hoax and virus emails.
Sincerely,
(Your Name Here)