Email notifications: How to use a different email sender?

2) contact always comes like JotForm, you can't come in contact the email of the person you're writing?

I'm not sure if I understood correctly your question, correct me if I did not.

You are trying to use the email and name of the submitter to receive the email notification instead of the default email address and name, in this case both of JotForm.

If so, then take a look on this guide: http://www.jotform.com/help/240-Set-Email-Field-as-the-Notification-Sender-Email-Address-with-Mandrill.

If you are trying to use your own email address to send the emails, then these guides will help you: 

http://www.jotform.com/help/236-How-to-use-Mandrill-to-Send-Emails-From-Your-Own-Email-Address

http://www.jotform.com/help/238-How-to-Add-a-Custom-Sender-Address-to-an-Email-Alert

http://www.jotform.com/help/244-How-to-Setup-SMTP-for-a-Form 

Hope this helps.