no i can use "not native" mail to configure it, i know how to do it $)
i want (if it's possible) to send mail from domain mail, for example from created mail such as firstname.lastname@example.org or register@....
Check this out under c-panel Modify MX record of domain
"This feature allows you to host email service of your domain with other provider. All you need is to change MX record (it shows where to deliver email sent to your domain). You can signup at Google Apps and you will get MX record for your domain free. Update it by using this form and enjoy the best possible email service with POP3, Webmail, Spam protection and many more from Google Apps or any other provider."