IMAP not working on HTC Desire

IMAP not working on HTC Desire

Hi, my email doesn't refresh using IMAP and show new emails on my HTC Desire, this was working ok previously but now I have a lot of emails in my Zoho webmail inbox that are not refreshing on the phone.
The account settings are correct and verifiy the login when I refresh but no mail is downloaded.
 
Can you help resolve this please
 
thanks