Within settings you are able to change the default email address that system emails are sent from.
In the Admin Portal, go to Settings and click on the tab Global
Expand Email and find the setting This is the default email address that system emails will use. Change the email to one that is appropriate for your account. You can also change the name of the email account, in the below setting The name of the email account all system emails are sent from.
Please note the following places where this default email will be shown
Internal Zunos messages – you have the option to either send communications from the login you are currently logged in with, or the default email
Reset Password Emails
Post Event Communications