In today’s MacTech deployment lab, the subject of using Identity payloads in configuration profiles came up.

Here: https://raw.githubusercontent.com/gregneagle/profiles/master/Identity_payload_demo.mobileconfig is a sample/demo configuration profile that contains both an Identity payload and an Email configuration payload.

When installed (by double-clicking the profile, after the normal warnings, the user is presented with a form for entering identification information:

After entering the requested information and clicking Continue, Mail.app gets a new Gmail account added with the information you entered.