If you receive the following email, it is fraudulent. If you followed the instructions in the email, you just gave away your financial information to some scammers:

From: Verified by Visa&MasterCard Sec (masterupdate@mastervisaserv.us)

Subject: Credit/Debit Card Account Suspension

Dear Visa/MasterCard owner,

We recently reviewed you account and we are suspecting that your account may have been accessed from an unauthorized computer.
We now need you to confirm your account information. If not completed within 24 hours we will be forced to suspend your account indefinitely as it can be used for fraudulent purposes.

To confirm your online account:
1. Click on the link below to open a browser window secure.
2. Confirm your identity and follow the instructions.
Keep your information safe-update

Thank you,
MasterCard&Visa
Security Department