Good evening,
I would like to know if it is possible to configure the system to open a ticket automatically when the customer sends an email to suporte@mydomain.com for example?
Yes you just set Osticket and put a POP or IMAP email address that osticket checks.
Please see the docs at: https://docs.osticket.com/en/latest/Getting%20Started/POP3-IMAP%20Settings.html