Jordi Cabot

In the Settings->Discussion page, authors of a post can use the checkbox Email me whenever – Anyone posts a comment.
But this does not send an email as well to the site admins. In blogs where you have a number of guest authors, you may want to be informed about all the new comments so you can respond (if the author is missing) or just participate in the discussion.
As a site admin myself, I was missing many comments. This means plenty of missing opportunities to engage with your audience.
To solve this situation, the plugin adds a new checkbox in the Discussion page. If checked, admins will get an alert email for new comments.

Comment Admin Notifier

Very simple plugin that doesn't try to do many things. But the one it does is very useful: as a website owner you want to make sure you're on top of all the comments in the site even comments to posts you didn't write. 

It does one thing and it does it right

With this plugin, admin users get an email alert every time a new comment is posted on ANY post in the site.

Andrew Lima

Easily add unlimited alert boxes for the new WordPress block editor. This includes dismissible alert notices.
This plugin works only in the Gutenberg/Block editor. Please use WordPress 5.0 and above or the Gutenberg plugin for pre 5.0 WordPress installations.

Simple Alert Blocks

Simple Alert Boxes are a nice elegant way to achieve quick alert styles within the block editor.

The code is well-done and lightweight and doesn't include too many fancy options.

In the future, I hope the author will consider more custom styling, but I suppose in order to keep the alert boxes simple, decisions over options is the right path here.

I have forked this plugin into something more advanced, so I am very intimate with the code in this plugin. Andrew hits it out of the park as usual.

Cheers,

Ronald Huereca

Very Simple as in its title

Simple alert notices for the new WordPress block editor.

Comment Admin Notifier vs Simple Alert Blocks