When an admin cancels an order, WooCommerce by default sends an order cancellation email to the admin. However, it does not send any notification to the customer. This extension bridges that gap by sending an automatic notification to inform a customer that their order has been cancelled by the admin for some reason.
As your business grows, you get more orders, but sometimes you need cancel an order due to stock availability or another issue. Here are some of the basic features of this extension:
<ul>
<li>Automatically sends an order cancellation email to the customer</li>
<li>Uses the standard WooCommerce order cancellation email layout</li>
<li>Allows you to customize the email subject, heading, and content like any other email</li>
</ul>
<img class="size-full wp-image-6420302 alignnone" src="https://woocommerce.com/wp-content/uploads/2020/09/Customer-cancelled-email.jpg" alt="" width="795" height="932" />

Order Cancellation Email to Customer

Send an automatic email notification to customer on order cancellation.

BuddyDev

Brajesh Singh

bbPress Notify Admin plugin notifies all the admins when a new topic is created or a new reply is posted on bbPress forum. It needs bbPress 2.2 or above. 
We use this plugin internally at BuddyDev to provide timely support.
For more details, please visit <a href="https://buddydev.com/bbpress/introducing-bbpress-notify-admins-plugin-notify-admins-on-new-topics-or-new-replies" rel="nofollow ugc">BuddyDev.com</a>
For support, please use <a href="https://buddydev.com/support/forums/" rel="nofollow ugc">BuddyDev Forums</a>.

bbPress Notify Admins

bbPress Notify Admins plugin notifies all site admins when a new topic is created or a new reply is posted on the bbPress based forums.

Order Cancellation Email to Customer vs bbPress Notify Admins