I have been using the yahoomail for a while now. I've recently switched from iPhone to an android phone, and I decided to install the Yahoo Mail app on my android phone. The mail app has lots of issues that I've noticed. Messages are coming in OK, but don't make a mistake of forwarding a message, because if you do and you later decided to reply the original sender, the reply will be sent to the person you forward the message to, not the original sender. Using the "Reply All" option did not help either. I have made this mistake a number of times before realising that my replies were being sent to the wrong recipient. I think Yahoo should take more time to test their mail app, especially the "Reply" and "Reply All" options, and how it affects forwarding messages. It is very frustrating to use.