Email failing to sign in

Hello everyone. I am experiencing similar problems as many of you are. I have an S5, and my email app is no longer working, but only for sending or receiving new emails. I can still look at emails in my folders thru my app but that's it. If I go to the yahoo.com site everything still works fine. I know very (and I do mean very) little about how these things work. From what little I can comprehend this is I'm guessing a problem with the company's (which one I'v not a clue) computer or server things, and not some button I'v accidently pushed that I shouldn't have. Has anyone actually had this problem get permanently fixed some how? Not including letmechooseausernameugh as theirs suddenly fixed it's self while they were typeing (you lucky son of a gun).
 
I have the same problem everytime i try to sign in to my email it always comes back with authtication failed, i know i have the right password and email because i can sign into hotmail just fine...
 
Lucky you! There are a lot of us with Samsung phones who are having problems with this fault. I want my normal everyday working well phone back, not being harassed by this problem. Enjoy your trouble free phone because this may be coming to you soon.