we just started using Asana for our company. Most of the employees do have there own email address, but there are employee who don’t have there own. It doesn’t felt necessary when someone is working only once or twice a week half a day. They are using the firstname.lastname@example.org email address. The email@example.com email address is used by everyone in the daily business, when general inquiries are coming in and so on.
(We are working in an Organisation, not a Workspace)