A ping test can help with the issue.
From the start bar search type in
Click on the program cmd to start the program.
Type in lower case ping youremailprovider.com (hit enter)
This test can be run at your home and friends. Which will report back if there is a connection and the IP address of that connection.
So write down the ip address for your house and the results from your friends.
It will help. Yours may even report back 100% fail. Or Host Unreachable.
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