Verify your outgoing server name is your SMTP Server. Highlight the outgoing server setting, then click 'Edit'. Select the option from the sub menu 'Outgoing Server (SMTP)'. CSVLK Server: N/A CSVLK PID: N/A ID: (1) Is Admin: Yes TestCab: 0x0 WGA Version: Registered, 1.7.18.5 Signed By: Microsoft Product Name: N/A Architecture: N/A Build lab: N/A TTS Error: N/A Validation Diagnostic: 025D1FF3-171-1 Resolution Status: N/A WgaER Data-> ThreatID(s): N/A Version: N/A WGA.You are only able to use an email client if you created a free att.net account before June 11, 2011.
Your Outlook is almost certainly not corrupted, it is the settings that are incorrect.