If you're just ramping up your small business email newsletter, you might be wondering what day you should send it to your opt-in list. After all, you want it to get opened and read and you know your prospects may be weeding through a ton of email clutter. What to do?There is no magic bullet to figure out the science behind when your small business prospects will open your email. But you can help yourself along by doing some up front legwork. And the answer is right in front of you.Don't do what.