Cannot Send Mail - the username or password incorrect - help please?

My Yahoo mail account on my iphone which has been working for a year today stopped letting me reply to emails. I can recieve fine but it will not let me reply to messages, comes up with "wrong username and password". I checked in Settings and they are both correct. I have also done the following but to no avaial:

Changed my password to something shorter with just letters
Turned phone on and off
Deleted the account and setup again

If anyone could help I would be most grateful as I have run out of ideas

3GS, iPhone OS 3.1.3, Yahoo mail account

Posted on Jan 28, 2011 4:46 AM

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Cannot Send Mail - the username or password incorrect - help please?

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