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wpmu_signup_user_notification_email filter-hook . WP 3.0.0

Filters the content of the notification email for new user sign-up.

Content should be formatted for transmission via wp_mail().


add_filter( 'wpmu_signup_user_notification_email', 'filter_function_name_3544', 10, 5 );
function filter_function_name_3544( $content, $user_login, $user_email, $key, $meta ){
	// filter...

	return $content;
Content of the notification email.
User login name.
User email address.
Activation key created in wpmu_signup_user().
Signup meta data.
Default: empty array


Since 3.0.0 Introduced.

Where the hook is called

wp-includes/ms-functions.php 1101-1109
	/* translators: New user notification email. %s: Activation URL. */
	__( "To activate your user, please click the following link:\n\n%s\n\nAfter you activate, you will receive *another email* with your login." ),

Where in WP core the hook is used WordPress

wp-admin/user-new.php 29
add_filter( 'wpmu_signup_user_notification_email', 'admin_created_user_email' );