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IMAP sync on Wifi but not on Mobile Broadband

The OP was asking about IMAP, not SMTP.

I had this problem when I first got a phone which couldn't download data access settings from the provider automatically - web worked, but nothing else. I had to figure out the correct settings for 2G/3G.

You could either check with your provider (although it might be difficult to get through their layer of mindless helpdesk drones), or find the settings on the web using google/bing/whatever.
 
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