The filtering option of incoming e-mails on Outlook Express program is only available with POP3 connections. To do this;

• you should follow this path; Tools | Message Rules | Mail.
• Then, in the window displayed, you should specify the rule that will govern your filtering action and click OK button.
  

  

• Follow this path afterwards; Tools | Message Rules | Block Senders.
• The e-mails received from the addresses you specified in here, will be directed to Trash (Trash) folder.