Direct Mail List Management

[Robert Treakle]

Hello,

I am new to direct mailers. I sent out a list of 1000 yellow letters about a month ago and I am preparing to send another list soon, however I am not entirely sure about some modifications to the list. I have removed people who have called and requested not to be mailed again, but should I also remove people who called in but did not turn into a deal for one reason or another? Any information is appreciated.

Thanks