I cannot receive emails from a friend with a yahoo email address. I can send emails to him and he receives them but he can't send to me. We have been emailing back and forth for years and then one day it worked just fine & the next it didn't. He told me that he can't even send the emails. He gets a error message that it is spam. I use Thunderbird but I also can't receive them on my providers web mail. Nothing has changed on my end and I have checked over everything that I can. May be on his end. I believe he uses him Android phone. Any one have any ideas what may be the problem?