How to block all email from someone in Outlook Express 5 Operating System(s): Windows 95, Windows 98, Windows Me, Windows XP, Windows NT 4.0, Windows 2000 Application: Microsoft Outlook Express Application Version(s): 5.x How to block all email from someone in Outlook Express 5 1) Open Outlook Express. 2) Select the email from your Inbox that you would like to block. 3) From the Message menu, choose Block Sender. 4) Click the Yes button. 5) Click the OK button.