This plugin for sent information about comment to post author. 
Information about author name and author e-mails sets in custom fields for each post. 
In configuration of plugin you can set keys name for custom fields. By default this is “Author name” and “Author email”. 
Also can set subject and body of notification e-mail. 
In body of e-mail you can use macros:
[name] – name of authr from custom field 
[url] – post url 
[title] – post title 
[comment] – comment text

Comment Inform

This plugin for sent information about comment to post author. Infromation about authors gets from custom fields. Custom fields keys are "Author  …

Simon

This plugin can send a alert message by LINE Notify

WP LINE Notify

This plugin can send a alert message by LINE Notify.

Comment Inform vs WP LINE Notify