WordPress at a glance
filter is not described

delete_site_email_content filter-hook . WP 3.0.0

Filters the email content sent when a site in a Multisite network is deleted.

Usage

add_filter( 'delete_site_email_content', 'filter_function_name_3660' );
function filter_function_name_3660( $content ){
	// filter...

	return $content;
}
$content(string)
The email content that will be sent to the user who deleted a site in a Multisite network.

Where the hook is called

In file: /wp-admin/ms-delete-site.php
delete_site_email_content
wp-admin/ms-delete-site.php 71
$content = apply_filters( 'delete_site_email_content', $content );

Where the hook is used (in WP core)

Does not used.