Situation: What happens in our tenant when it receives an email for an Incident from a person who does not yet exist in the system?
Does the application automatically create it and save the Name from the email as well as the email address?
There are different Options you can select depending on your business needs.
This is configured within the settings for the inbox that the user is emailing to.
You can select the option to add a new person as an user when emailing into an Incident by choosing method 1 and then selecting the option 'Create Record by Creating or Linking the Employee or External Contact.
See image below: