The Yahoo mail got hacked, he managed to reset the password and got it back. Since then, he can no longer receive mails, he gave me his password, I'm logged in trying to fix it. He's using the free service.
I'm not a Yahoo user, I have a yahoo but don't use it. I googled, I found many users complaining, no answers. So I'm started to think that this issue has nothing to do with the account being hacked.
Is there an option in the mail that would prevent the user from receiving mails? His settings are like mine, I tested my yahoo, it worked. His Yahoo doesn't receive mails, he has no filters, he blocked 1 user, nothing else.