The reply I got back from Citibank shows their callous attitude towards their customers and particularly regarding the issue of spam:
From: India Service [mailto:email@example.com]
Sent: Wednesday, September 26, 2007 8:39 AM
To: Murali Krishna Devarakonda
Subject: RE:'Citibank=006-038-728' Unsubscribe
Dear Mr. Devarakonda,
This is with reference to your email dated September 25, 2007.
To withdraw the promotion mailer facility, we require the Coupon A form. The form is available in the nearest NRI centre.
The list of NRI Centers are available in the 'Contact Us' under the "customer service" option in our website www.citinri.com.
We assure you of our best attention at all times.
Officer - Customer Care.
[Originally posted on my personal blog at muralikd.blogspot.com, September 26, 2007]