Eating your own dog food

I got this unsolicited e-mail today:

Hi,

Hope you doing well. I am writing in regards to see if there is any possibility for us to work with your company. We are leading provider of B2B, B2C and B2G lists and excellent list compiler with highest delivery rate and data appending solutions. Our opt-in email database of Key decision makers can be used for your online promotion, brand awareness and to generate potential leads.

We build list according to your requirements based on your targeted business. We are specialized in Email Campaign and Data Append Solution, where you can add your clients missing data (email, fax etc).

Apparently they provide opt-in only mailing lists.  Shame they don't use them themselves.