quan_flo

If there is a user (or a bot) that signed up at your site this user can start to send messages to every other user. 
I had some negative experiences with this and so I wrote a module that should help to block such a spam.
Buddypress Messages Spam Blocker introduces some restrictions to your users:
<ul>
<li>New users can send messages only 24h after their registration, so you’ll have time if bot registrations have to be removed manually (modify this value using filter ‘buddypress_messages_spamblocker_newMembersWaitingPeriod’)</li>
</ul>
Their are also some more restrictions for mass mailings (mails that are sent to “friends” of the contact list are not included in this calculation):
<ul>
<li>Users can send 6 messages maximum in 5 minutes (modify this value using filter ‘buddypress_messages_spamblocker_5m’)</li>
<li>Users can send 10 messages maximum in 10 minutes (modify this value using filter ‘buddypress_messages_spamblocker_10m’)</li>
<li>Users can send 20 messages maximum in 30 minutes (modify this value using filter ‘buddypress_messages_spamblocker_30m’)</li>
<li>Users can send 30 messages maximum in 60 minutes (modify this value using filter ‘buddypress_messages_spamblocker_60m’)</li>
<li>Users can send 35 messages maximum in 12 hours (modify this value using filter ‘buddypress_messages_spamblocker_12h’)</li>
<li>Users can send 45 messages maximum in 24 hours (modify this value using filter ‘buddypress_messages_spamblocker_24h’)</li>
<li>Users can send 50 messages maximum in 48 hours (modify this value using filter ‘buddypress_messages_spamblocker_48h’)</li>
</ul>
Users with the capability “edit_users” (admins etc.) have no restrictions for outgoing messages
Install, activate, and it will work.
More about me and my plugins
Since the year 1999 I do administration, customizing and programming for several forums, communities and social networks. In the year 2013 I switched from another PHP framework to WordPress. 
Because not all plugins I’d like to have exist already I wrote some own plugins and I think I’ll continue to do so.
If you have the scope at forums or social networks my other modules might also be interesting for you. <a href="https://wordpress.org/plugins/search.php?q=quan_flo" title="ifs-net / quan_flo WordPress Plugins" rel="ugc">Just take a look at my WordPress Profile to see all my Plugins.</a> Use them and if my work helps you to save time, earn money or just makes you happy feel free to donate – Thanks. The donation link can be found at the right sidebar next to this text.

Buddypress Messages Spam Blocker

This plugin will block mass mailing for the buddypress messaging system

yourplugins

<h4>Show cart messages in WooCommerce cart based on conditional rules</h4>
Adding cart notices to your e-commerce cart? Very easy with Conditional Cart Messages.
A more dynamic way to show a message or a notice in your WooCommerce cart!
<ul>
<li>You can set different rules to make the message appear, such as the total price of the cart or the product price.</li>
<li>Combine the rules to make the message appear at specific conditions, for example: If the total price of the cart is greater than $ 100 and the quantity in the cart is less than 5 show the message.</li>
<li>Use the AND or OR operators to combine rules. You can also create rule groups.</li>
</ul>
You can find the official documentation <a href="https://yourplugins.com/documentation/your-woocommerce-conditional-cart-notices/getting-started" title="YourPlugins Conditional Cart Notices Official Documentation" rel="nofollow ugc">here</a>.
<h4>Looking for more features?</h4>
<ul>
<li>Display a message also in the checkout, product, shop or any other page</li>
<li>Get more conditions: Price, Products, Categories, User Roles, User Types, Billing and Shipping Country, Start and End Date, Product Quantity, Total Quantity, Total Amount, Total Net Amount, Total Taxes, Shipping Total, Total Coupon Discount Amount, Referrer URL</li>
<li>Create unlimited message templates</li>
<li>Add an icon to your message</li>
<li>Add a button to your message</li>
<li>Choose the background color (also on hover), the border color (also on hover), and the text color of your message</li>
<li>Choose the background color, the border color, and the text color of your button</li>
</ul>
Check all the other premium features <a href="https://yourplugins.com/product/your-woocommerce-conditional-cart-notices" title="YourPlugins Conditional Cart Notices Premium Features" rel="nofollow ugc">here</a>.
<h3>A brief Markdown Example</h3>
<ol>
<li>From your WordPress back-end click on “YourPlugins > WooCommerce Conditional Cart Notices”</li>
<li>Click on “New Notice” and type in a “Name”</li>
<li>Click on “Add rule” and set the following condition: “Price” “greater or equal” “100”</li>
<li>Set “Show Notice In” = “Cart” and add a message inside the field “Notice Message”</li>
<li>Click on “Save”.</li>
<li>Create a WooCommerce Product with a price greater then 100.</li>
<li>Add the created product to cart and check your cart: A message should appear.</li>
</ol>

Conditional Cart Messages for WooCommerce – YourPlugins.com

Show cart messages or notices in your WooCommerce cart by using conditional rules! Made with love by yourplugins.com

Buddypress Messages Spam Blocker vs Conditional Cart Messages for WooCommerce – YourPlugins.com