This email with the subject "I.R.S. USA for Businesses: Important notification to all business Accountants and Treasury Managers!" was received in one of Scamdex's honeypot email accounts on Thu, 10 Jan 2008 00:44:45 -0800 and has been classified as a Advance Fee Fraud/419 Scam.
The sender was "Internal Revenue Service United States of America for Businesses" <email@example.com>, although it may have been spoofed.
Attention to all Business/Corporate Accountants and Treasury Managers!