Email -- Please Help

I am trying to use the stock email app for my yahoo email (but it is through bellsouth, so it is paid, and works if I set it up as a premium account) but sometimes I notice I have not received emails in a while so I check the email app...and it has deleted my info! It is back to the "set up an account" screen. Why is this happening? I thought it was because Yahoo logs you out after a period of time, but if I go through my laptop I am still signed in.


Is there a better email app that I can use? A free one? I want my emails timely, and yes I have forwarding through Gmail app also but they are delayed by an hour.

Please help, maybe I can do something different to fix this.

I've never used it before, but K-9 Mail seems to be a favorite email client for many people.