DjZoNe

This plugins main goal was to provide the ability to any of your registered users, to invite more people to the community.
Please notice, that this plugin totaly ignores whether the registration is enabled or disabled to your blog.
<a href="https://downloads.wordpress.org/plugin/invite-friends.0.3.zip" rel="nofollow ugc">Download now!</a>
<a href="http://invite-friends.dev.rain.hu/" rel="nofollow ugc">Support</a> | 
<a href="http://invite-friends.dev.rain.hu/faq/" rel="nofollow ugc">FAQ</a> | 
<a href="http://djz.hu" rel="nofollow ugc">Author</a> 
<a href="https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=djzone@cracker.hu&item_name=Invite%20Friends%20for%20Wordpress" rel="nofollow ugc">Donate</a>
Some functions:
<ul>
<li>invitation sending</li>
<li>invitation cards limit per site</li>
<li>after activation, the user is logged in automatically</li>
<li>after activation, the user can be redirected to a custom URL</li>
<li>activation screen is using the same styles as the login screen (if you have customized login screen it will affect the activation screen as well)</li>
<li>Dashboard for custom settings Plugins > Invite friends settings</li>
<li>i18n support (localized messages)</li>
</ul>

Invite Friends

This plugin give the ability to anyone how registered to your blog, to invite more people, even if the registration is closed.

Janos Ver

By default when you send any notification from your blog (including many of the plugins as well) sender is “WordPress” and the sender e-mail address is <a href="mailto:wordpress@yourdomain.com" rel="nofollow ugc">wordpress@yourdomain.com</a>. I wanted to have personalized sender name and e-mail address that is why I created this plugin. Then I added features to send out e-mail notifications about newly published posts to users who are interested either automatically (on publish) or manually.
This plugin will enable you to
<ul>
<li>
Replace default <a href="mailto:wordpress@yourdomain.com" rel="nofollow ugc">wordpress@yourdomain.com</a> to any e-mail address
</li>
<li>
Replace default e-mail from “WordPress” name to anything you want
</li>
<li>
Send e-mail notifications automatically/manually to all registered users about new public posts
</li>
<li>
Easily customize notification e-mail subject and content templates
</li>
<li>
Re-send e-mail notifications manually as well
</li>
<li>
Send notifications about password protected posts as well (password will NOT be included in notification e-mail)
</li>
<li>
If you have <a href="https://wordpress.org/plugins/wp-jv-post-reading-groups/" rel="ugc">WP JV Post Reading Groups plugin</a> installed then entitled users can receive notifications about new private posts as well
</li>
<li>
Users can opt-out if they don’t want to receive e-mails (they can choose to get all/nothing)
</li>
<li>
Bulk subscribe/unsubscribe users to/from e-mail notifications (go to Users->All Users and see bulk actions)
</li>
<li>
Maintain e-mail log about sent e-mail notifications
</li>
</ul>
Translations
<ul>
<li>
Hungarian – Janos Ver (last updated for plugin v2.3.1)
</li>
<li>
Serbian – Andrijana Nikolic (last updated for plugin v2.2)
</li>
<li>
German – Matthias Siebler (last updated for plugin v2.3.1)
</li>
</ul>

WP JV Custom Email Settings

THAT is what i need! So cool integrated. 
Thank you for this PlugIn. I love it.



Love it...

The author obviously thinks the issue mentioned by Sublines is not worth looking into. Therefor I'll have to give a 1 str so he can start noticing.
Everytime you update a post, the notification gets sent to all the subscribers AGAIN. If I decide to make 100 changes that day, the subscribrs will get 100 emails. Its just rediculous.
Also, lately, the sending doesnt work, so I dont think its compatible with my current WP installation 4.4.1



Emails get sent on every update of the post

Notify users about new posts published and customize your e-mail notification settings

Invite Friends vs WP JV Custom Email Settings