Ashish Kumar (Ashfame)

Plugin offers a admin screen to select the posts of which commentators should be emailed, and then you can write the subject & message to send and the plugin will send them an email along with their comment history on the selected posts.
You also have the option of excluding list of emails and specifying a Bcc email address.
If you find a bug, please report the issue here – https://github.com/ashfame/email-posts-commentators/issues

Email Posts Commentators

frenchsquared

Comment-Emailer allows you to customize the email wordpress automatically 
sends when a new comment, pingback or trackback has been approved. 
With Commented-Emailer you can change the sending email address, message body, 
and enable or disable all of the default options such as including the authors 
name, ipaddress, website, comment or reply to address.
After installation you will have a new tab under settings that 
will give you access to change just about every access of your 
auto generated emails. Just make sure you enable Commented-Emailer

Comment-Emailer

Comment-Emailer allows you to customize the email wordpress automatically sends when a new comment, pingback or trackback has been approved.

Email Posts Commentators vs Comment-Emailer