I like emails, especially the ones, where someone offers me money to do something for him or her.
I don't like emails where people ask questions related to questions or answers I posted on magento.se or stackoverflow. This page doesn't send emails to me, why? Because I want to decide WHEN I visit this site and which questions I answer. Comment the questions and answers, open new questions. When I'm here the next time I may comment your comment - or not. If you want my expertise or time you can hire me.