Chris Baltazar

Easy to setup and get the ball rolling, you just need to fill out the common email config fields as any other webmail client
Works also for private providers like AWS SES 
After that you can just select the desired evens to be notified about and that’s it
Manage everything from a single and very dynamic admin screen in your dashboard and get the plugin working just in a few minutes
Just install it and then do directly into Settings / WP Simple Notify to see all the options. Enjoy it!

WP Simple Notify

It's very easy to setup and make it work, you can also make a test for your configuration and goes smoothly with all comment notifications

Super simple and efficient

Easiest WP Plugin to manage email notifications for common events such as user's post comments.

Rafal Toborek

This plugin is currently in alpha stage. It includes only basic features like sending e-mail notifications using built-in PHP mail() function or by using external SMTP server (recommended). Work of this plugin depends mostly on the SMTP server configuration.
Lemme Know plugin allows you to send e-mail notifications only for a small amount of subscribers. There are plans to implement Cron-based solution which will allows to send notifications in chunks and omit server limitations.

Lemme Know

Sends e-mail notification for all subscribers when a new post is published.

WP Simple Notify vs Lemme Know