Cannot send email through Comcast or another address through Windows Live Mail, and cannot open Properties

Recently I started having issues with Windows Live Mail, I now cannot send from my comcast address or my own website address, both of which I receive just fine. I can still send from my hotmail address, which is also received through Windows Live Mail. When I click on the Properties tab (under Accounts) to check the settings, which is suggested, it will not open.  Any help available with this issue?  thank you.

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