What is the exact error message? Is this an error from Thunderbird or from the server?

there is no enough disk space to download email in thunderbird in Ubuntu but I am having more than 200GB space This error is coming from Thunderbird.

Can you post a screenshot of the error? http://support.mozilla.org/en-US/kb/how-do-i-create-screenshot-my-problem

Thanks for your response this problem is occured becasue Inbox folder is full with 4 GB after comacting I am able to receive mail.

I am having one question why there is limitation of Folder size in TB.

There isn't a fix 4 GB limit. However, it's best practice not to let grow mail folders indefinitely. The 'not enough disk space' error can also be an indication of mail folder corruption. So make sure you always have a recent backup of your Thunderbird profile folder.