AutoSupport's sent to NetApp have several transport options, SMTP (EMail), HTTP or HTTPS (Web posting), HTTP or HTTPS via web proxy. This tranmission is controlled by options autosupport.support.enable, options autosupport.support.transport, options autosupport.support.to options autosupport.support.proxy.
Additional copies of the AutoSupport and/or an abbreviated "pager style" notification are sent using SMTP (Email) and are controlled by options such as options autosupport.to and autosupport.noteto, etc.
From the description, it would seem adding the desired local email addresses to options autosupport.to and/or options autosupport.noteto would satisfy what is needed. The options autosupport.mailhost would be used for delivering the desired Email message.
One can find more information in the "Data ONTAP 7.2 System Administration Guide" and later guides in the section about "AutoSupport options" and in the manual page for the "options" command.