Please how to fix this? Warning: The number of users (2803) plus overhead exceeds the PHP max_input_vars setting (1000). You will not be able to send email to more than 990 users in one batch. This can be changed by increasing the value of max_input_vars setting in the PHP.ini configuration file.
Along with max_input_vars, you will need to increase value for two more variables as below: max_input_vars = 3000 suhosin.post.max_vars = 3000 suhosin.request.max_vars = 3000 Open up your php.ini file and search for above variables, set the value and save the changes. To know loaded configuration of php, create a php file along with your site pages and add following code: <?php phpinfo(); ?> Then browse this file, you will see the path of your php.ini file where you need to make these changes.
The filter permission module can help with the permissions page by restricting what information is loaded at given time. But you can still have a problem if your filters aren't strict enough.