Some email truble with a Yahoo account and the iPhone

I receive google alerts sent to my Yahoo acct. When I try to open them on my iphone it says “this message has no content.” Any ideas??? Only the messages from google get this message. Other messages that are from persons show up fine. The content of the google messages are fine in my yahoo acct. I have deleted the acct off of my iphone, reset my password on yahoo and restarted my iphone to no avail. Thanks