Via G Suite, we could provide e-mail addresses for members and contributors without it costing us anything. I'm thinking we should use something on the form of email@example.com – "friv" for "frivillig" (volunteer). Since we're using G Suite, they'll work like normal Gmail accounts. The reason we should use this form and not just firstname.lastname@example.org is to make it clear to recipients of emails that the person they're getting emails from is a volunteer that doesn't necessarily represent Wikipedia.
It should be made very clear to the users that this comes with elevated rights for those that admin the e-mail account, inclusive their ability to wipe the volunteers devices.
G Suite Administrator Help : Manage user devices from an Android device (subpoint "Wipe a device’s data")