Hi @marcorossi2,
Thanks for reaching out! You can only send WordPress email notifications from your Easy WP SMTP authenticated email account. The purpose of the Easy WP SMTP plugin is to authenticate your email before sending it so that your emails will not be flagged as SPAM.
In case it helps, you should be able to set a “reply-to” email within your contact form notification settings, so that you should be able to reply to the user who submits the form. In case it helps, please refer to the Contact Form 7 documentation.
I hope this helps. Thanks!