i am getting ready to do a mass postcard mailing for the first time this year. any advice on how many to send out? i plan on doing two mailings, one now and one in mid april. what is the response rate on some thing such as this? i am also going to stick a heavy duty post it note to some of the postcards that can be peeled off and stuck elsewhere rather than getting thrown away. the guy in charge of the mailing seems to think this is a good idea.