grosbouff

This plugin adds a checkbox in the post/page admin (for the admins and editors) to tell members (notification & email) that an important post has been published :
Just check the checbox at the bottom of a page/post when editing it. 
(You won’t be able to post a notification if the post/page is not published; password protected or if a notification has been sent before.) 
(If a notification has been sent before; the checkbox will be disabled. You can eventually re-enable it by deleting the meta key bp_admin_notifications_sent.)
Careful : I don’t have tested this plugin with a large amount of members. I suspect the mail function could not support it. Please tell me if you try !

BuddyPress Admin Notifications

This plugin adds a checkbox in the post/page admin (for the admins and editors) to tell members (notification & email) that an important post has  …

Kleor

Contact Manager allows you to easily insert contact forms (with or without CAPTCHA) into posts, pages and widgets of your website. You can create an unlimited number of contact forms and customize them completely. If you wish, Contact Manager can also record the messages in your database, and allows you to automatically offer a gift to people who send you a message.
<ul>
<li><a href="https://www.kleor.com/demo/wp-login.php?login=tester&plugin=contact-manager" rel="nofollow ugc">Demo interface</a></li>
<li><a href="https://www.kleor.com/contact-manager/" rel="nofollow ugc">Documentation</a></li>
</ul>
Here’s <a href="https://www.kleor.com/contact/" rel="nofollow ugc">a sample form that you can add to your website</a> with Contact Manager. See <a href="https://www.kleor.com/your-opinion/" rel="nofollow ugc">another sample</a>.
<h4>Quick Start</h4>
Here’s how to set up a form in less than 20 seconds:
<ol>
<li>Insert the <code>[contact-form id=1]</code> code into your posts/pages/widgets to display this form.</li>
</ol>
That’s all!
The “Back Office” page of Contact Manager allows you to customize your interface. With this page, you will can display the items that are useful for you and remove the others. In short, you will get an interface that fits precisely to your needs. We advise you to quickly browse through the admin pages of Contact Manager in order to have a global vision, and then take the time to properly configure your options.
<h4>Maximum performances for a better SEO</h4>

Some WordPress plugins slow down the websites that use them. Contact Manager has been developed with a lot of attention to its performances so that it doesn’t slow down your website and it remains fast.
Moreover, contrary to a common practice among WordPress plugins/themes, Contact Manager doesn’t add any CSS or JavaScript files to the pages of your website, in order to not increase their weights or the number of HTTP requests. So even after installing this plugin, your website’s pages will still load as quickly as before, and their Google PageSpeed scores will not drop.
<h3>Plugins from the same author</h3>
<ul>
<li><a href="https://www.kleor.com/commerce-manager/en/" rel="nofollow ugc">Commerce Manager, to sell your products</a></li>
<li><a href="https://www.kleor.com/affiliation-manager/en/" rel="nofollow ugc">Affiliation Manager, to create your affiliate program</a></li>
<li><a href="https://www.kleor.com/membership-manager/en/" rel="nofollow ugc">Membership Manager, to create your members areas</a></li>
<li><a href="https://www.kleor.com/optin-manager/en/" rel="nofollow ugc">Optin Manager, to build your prospects lists</a></li>
<li><a href="https://www.kleor.com/easy-timer/en/" rel="nofollow ugc">Easy Timer, to display count down/up timers</a></li>
<li><a href="https://www.kleor.com/content-switcher/en/" rel="nofollow ugc">Content Switcher, to display random or variable contents</a></li>
<li><a href="https://www.kleor.com/device-detect/en/" rel="nofollow ugc">Device Detect, to detect smartphones and tablets</a></li>
</ul>

Contact Manager

Some WordPress plugins slow down the websites that use them. I created Contact Manager with a lot of attention to its performances so that it doesn't slow down your website and it remains fast.

Moreover, contrary to a common practice among WordPress plugins/themes, Contact Manager doesn't add any CSS or JavaScript files to the pages of your website, in order to not increase their weights or the number of HTTP requests. So even after installing this plugin, your website's pages will still load as quickly as before, and their Google PageSpeed scores will not drop.

Maximum performances for a better SEO

Allows you to create and manage your contact forms and messages.

BuddyPress Admin Notifications vs Contact Manager