I'm a C-level executive. I am more familiar with my infrastructure and pain points than any cold-call salesperson will ever be, so if I need a third party solution to a problem, I use the internet to find it.

I'm not going to waste my working time communicating with a salesperson back and forth for a product I'm not interested in. One, it only validates that I read their email, and two, the end result is the same - I don't buy the product.