Generate a 4-star review (1 being lowest and 5 being highest) about an app with package com.fsck.k9.
A:
Certificate errors & POP settings lacking - days vs. # Tons of certificate errors on outgoing server since update. I really wish the app didn't have to download a set number of messages. If I delete a new email why do really old emails reappear so I have to mark them read - again  and again  and again? this isn't required for Yahoo mail just my POP.