wpdever

This plugin helps you tailor your notifications and alerts to the users interests. 
Automatically send a new post notification or email digest to all users subscribed to one of its categories, tags, or authors. 
For each post published, you might not want to send an email to your entire email list. 
This plugin will help you segment subscribers to send targeted emails. 
Send an email grouping together the latest blog posts relevant to users preferences. 
Store locally and send with the provider of your choice, or store and send with mailchimp.
Grow your mailing list and collect subscribers interests : Insert a subscription and category/tag selection form anywhere on your website. 
Send highly relevant emails automatically : Notify users when a result for one of their searches, or a post under a category or they’ve marked as relevant to their interests, has been added. 
Decide how often you want to send an email digest of published posts : Email frequency matters. You can group together a few blog posts to send at your desired frequency.
<h3>Examples</h3>
You can add a subscription form offering multiple choice categories anywhere you want, if you want to segment your users by post category or tag of interest. 
Or, for your signed up users, you can track their recent search queries to be able to notify them if a new post matching one of them has been published.
<h3>Shortcode</h3>
<ul>
<li>[target-categories-form] shortcode : Show newsletter and categories selection form</li>
<li>[target-tags-form] shortcode : Show newsletter and tags selection form</li>
</ul>
<h3>Integrations</h3>
Mailchimp : Send targeted posts to your audience using Mailchimp

Target Notifications

Let site users subscribe to categories or tags . Send post updates automatically.

Rafael Mardojai CM

Use responsives alert boxes with shortcodes. 
Is easy, only use the shortcode.
Example: For a info message use: 
 [alert type=”success”]Your text here[/alert] 
Also you can change the icon size: 
 [alert type=”success” icon-size=”big”]Your text here[/alert]
Shortcode attributes:
<ul>
<li>
type (defines the style of the alert box):
<ul>
<li>info (display a info style box)</li>
<li>success (display a success style box)</li>
<li>warning (display a warning style box)</li>
<li>danger (display a danger style box)</li>
</ul>
</li>
<li>
icon_size (defines the icon size):
<ul>
<li>normal (icon normal size)</li>
<li>small (icon small size)</li>
<li>big (icon big size)</li>
<li>hide-icon (no display the icon)</li>
</ul>
[alert type=”type” icon-size=”icon-size”]Your text here[/alert]
</li>
</ul>
<ul>
<li>Demo & Examples: http://www.rafael.mardojai.com/simple-alert-boxes-plugin/</li>
<li>Github repository: https://github.com/mardojai/Simple-Alert-Boxes-Wordpress-Plugin</li>
</ul>

Simple Alert Boxes

Nice

Use responsives alert boxes with shortcodes.

Target Notifications vs Simple Alert Boxes