To filter in received messages, click on the 
button next to the category you want to filter.
The users can filter in the categories Subject, Sender and Sent Time and Date
When clicking on the Subject filter, a dropdown menu will open with the subjects or the all their received messages. Click on the desired subject to filter.
When clicking on the Sender or Receiver filter, a dropdown menu will open with all the senders or receivers. Click on the desired sender or receiver to filter.
When clicking on the Sent Time and Date filter, a dropdown menu will appear with all the dates of the received messages. The user can develop the sections year, month, date and hours. Click on the desired date/time to filter.
