can I reload the mail app? yahoo mail app problem

katalone

New Email
my iphone4 is downloading currant emails for 2 yahoo accounts but not for a 3rd... when "connecting" for this one account it shows "downloading ### emails" for a split second, then nothing - the ### increases over time - it doesn't show new emails at all. When I go online there are new emails that aren't showing in the app. Why is the app working for 2 accounts and not the 3rd? I have deleted the account, then restarted it, and then it downloads emails to an earlier date, not even as late a date as it was before.
 
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