I have been using solo ads for a while 6 months and have found that with more and more solo ads I add to my list my open and clicks have steadily declined. Is there are particular way that you should mail to them? I mail twice a day am and pm @10 and mail unopens once changing the subject line. My open rate fluctuate between 2- 4%. I have a buyer list of 230 when I mail them offers open rates are between 17% and 28%. I have tried multiple suppliers I believe that either the supplier, my email strategy or both may be at fault. Any help would be appreciated.