This email with the subject "Comerica Bank - Protect your account. It's easy." was received in one of Scamdex's honeypot email accounts on Tue, 15 Apr 2008 06:59:20 -0700 and has been classified as a Advance Fee Fraud/419 Scam.
The sender was "Clients support team" <firstname.lastname@example.org>, although it may have been spoofed.
Client authentication using digital certificates in COMERICA BANK®