啊，有一个插件可以做到这一点，但它也有更多的功能。

Check here (plugin - WelcomeUser!)

添加到您的函数中。php文件：

add_filter(\'wpmu_signup_user_notification\', \'my_if_notification_required\');

function my_if_notification_required( $user ){
    $user = get_userdatabylogin( $user );
    if( $user && in_array(\'editor\', $user->roles) ) return true;
    else return false;
}

add_filter( \'wpmu_signup_user_notification_email\', \'my_notification_text\');

function my_notification_text( $user, $user_email, $key, $meta ){
    $user = get_userdatabylogin( $user );
    if( !$user || !in_array(\'editor\', $user->roles) ) return false;
    $message = \'Your message\';
    return $message;
}