Hi, someone sent a message to all may email contacts on my behalf... when my friends warned me I checked my gmail account and all my messages (inbox and sent) were gone. Somehow we could restore the contact list but not the mails. Very annoying because I have a lot of useful information in my letters. Any ideas? Gmail can not help - I asked. Thanks for your help

If Google cannot help then you are out of luck.
Sorry about that, but that's one of the risks of using webmail.