I'd definitely use a different email address. In addition to spambots crawling the blog there are jerks that will disagree with something you said and manually

I'd definitely use a different email address. In addition to spambots crawling the blog there are jerks that will disagree with something you said and manually enter your email address into porn sites, shady-deal sites, and others when they have a bad day. It is incredibly cheap/easy to get a second email address so simply do that.