How to stop mail from going to spam folder?

How can I stop my yahoo e-mail from putting my friends e-mail address in the spam folder?

• When I went to the spam folder and saw his e-mail in there I checked off his message and then I clicked "clear flag". After that he sent me another e-mail but it still ended up in the spam folder.

• Answer:

  ?? "clear flag" ?? The only thing that does is to remove the flag----and has absolutely nothing to do Spam. You need to open the Spam folder---then OPEN his email and click the "Not Spam" tab, which will redirect it to your inbox. Then you must put his address into your Contact List, to prevent the same thing happening again and again.