How often do you delete contacts from your mailing list? I use i-Contact & can see who opens/reads my newsletter. I've got a lot of 'dead' e-mail addresses that I'm wondering if I shouldn't delete. They haven't opened my newsletter since I've started sending it & I've tried contacting many times just to check in with them. I've not heard anything from them since my initial contact at a show or booth. What would you do?