Sounds like this was on a MacBook, Pro or Air? if so go the clean install route as updates somtimes do cause problems. First check your Mail Preferences and make sure your account and mail servers are correct.
Thanks again for your reply!
On my mac book air i had not any problem after downloaded mavericks. The problem is for my i mac. I checked whatever you told me but nothing again. Then I deleted the "mail" in order to download it again ! Here is the mess now ! I can find nothing to download or to take it back from trash! any propose ?
To reinstal mavericks, but there is not exist anymore the "mail"
You will need to boot to the recovery partition (hold down command + r) and reinstall Mavericks in order to get the Mail application back. Hopefully, you've been making backups of all your data.
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