I have figured out on my own that I can manually change the normal and insecure HTTP to HTTPS in Yahoo email.
Unfortunately, what I’ve also figured out is that when you do that, now you can’t download any attachment in emails. It freezes in the “Scan for Virus” mode. To download attachments, you need to change back to HTTP and then you can download your attachment. What a pain.
Yahoo Email – Get your act together and make HTTPS the standard which most of the world is going to.