this morning my email client was not working. I did a screenshot of the problem. When I restarted it I discovered the mail of yesterday (only of yesterday) were completly deleted! D’you know if it’s possibile to find them somewhere else? 
Hi Stefano,
Missing mails can be recovered from eM Client backup.
There is a chance that they are still stored on server so please try to check your webmail.
Ultimately if you are not able to locate them, you can contact your provider and ask them about data recovery.
If you want you can always send copy of logs you send but in notepad, screenshot will capture the log partially so unfortunately we are not able to see whole content.
To copy everything from Log tab, press Ctrl+A and paste it to the notepad and send it to me: [email protected].