WordPress at a glance
filter is not described

wpmu_signup_blog_notification_email filter-hook . WP MU

Filters the message content of the new blog notification email.

Content should be formatted for transmission via wp_mail().


add_filter( 'wpmu_signup_blog_notification_email', 'filter_function_name_5495', 10, 8 );
function filter_function_name_5495( $content, $domain, $path, $title, $user_login, $user_email, $key, $meta ){
	// filter...

	return $content;
Content of the notification email.
Site domain.
Site path.
Site title.
User login name.
User email address.
Activation key created in wpmu_signup_blog().
Signup meta data. By default, contains the requested privacy setting and lang_id.


  • Since MU (3.0.0)

Where the hook is called

wp-includes/ms-functions.php 891-894
apply_filters( 'wpmu_signup_blog_notification_email',
	__( "To activate your blog, please click the following link:\n\n%s\n\nAfter you activate, you will receive *another email* with your login.\n\nAfter you activate, you can visit your site here:\n\n%s" ),
	$domain, $path, $title, $user_login, $user_email, $key, $meta

Where the hook is used (in WP core)

Does not used.