Brandon Allen

<blockquote>
NOTE: As of BuddyPress 2.5.3+, this plugin is no longer needed.
</blockquote>
BuddyPress 2.5 introduced some wonderful email functionality. In order to do this, it bypasses WordPress’ default email methods. This means that any filters you applied to the <code>wp_mail_from</code> and <code>wp_mail_from_name</code> filters don’t work with emails sent by BuddyPress. This plugin translates those filters into something BuddyPress can use.

BP Email to WP Mail From Bridge

This plugin should be in core

>NOTE: As of BuddyPress 2.5.3+, this plugin is no longer needed.

shawfactor

This plugin allows admins to set the default email notification preference for users. When a new user registers, these preference gets updated for them
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LH Buddypress Default Email Notifications

Allows admins to control the default email preference for users on BuddyPress based social network..

BP Email to WP Mail From Bridge vs LH Buddypress Default Email Notifications