From Snopes.com...seems Mr. Allison was once the ever faithful M. John Stellford! Here are more details from a press release by the FBI dated 22 February 2005:
FBI ALERTS PUBLIC TO RECENT E-MAIL SCHEME
E-mails purporting to come from FBI are phony
Washington, D.C. - The FBI today warned the public to avoid falling victim to an on-going mass e-mail scheme wherein computer users receive unsolicited e-mails purportedly sent by the FBI. These scam e-mails tell the recipients that their Internet use has been monitored by the FBI’s Internet Fraud Complaint Center and that they have accessed illegal web sites. The e-mails then direct recipients to open an attachment and answer questions. The attachments contain a computer virus.
These e-mails did not come from the FBI. Recipients of this or similar solicitations should know that the FBI does not engage in the practice of sending unsolicited e-mails to the public in this manner.
Opening e-mail attachments from an unknown sender is a risky and dangerous endeavor as such attachments frequently contain viruses that can infect the recipient’s computer. The FBI strongly encourages computer users not to open such attachments.
The FBI takes this matter seriously and is investigating. Users receiving e-mails of this nature are encouraged to report it to the Internet Crime Complaint Center via http://www.ic3.gov.
I love Snopes.com.