I was trying to find a way to send email to post commenter’s, but this Email Commenters plugin hardly solves the issue. It just puts an email icon at the admin bar, clicking that link goes to your email client. And it didn’t worked for me as the email address were broken.
So here’s the plugin, just select all post or select a single post and click next. All the email addresses will be fetched and will be added to the Bcc list. Compose your mail and give a subject, hit send. Easy as pie.