As noted elsewhere, I use Aweber for my email services and they have a great system that ensures you only get emails from people you invite into your inbox. I hope to be one of those people, so sign up for the newsletter.
Note that it is common for bots to scan the internet, especially the comments sections of blogs, and skim off the email addresses for junk mailers. There’s not much that can be done to avoid that. I use a free Gmail account for most of my commenting on other sites and depend on Gmail’s built-in spam filters.