Account provisioning for user groups

Is your feature request related to a problem? Please describe.

Currently, the account provisioning feature only works for individual users and when their email addresses match. However, if I have a service email address such as support@mydomain.com, I have to manually add it to each user who needs access, which can be a tedious process when when there are a lot of users.

Describe the solution you'd like

It would be great if the account provisioning feature allowed more mailboxes/email addresses per domain and could also be applied to specific user groups. The use case would be as follows: Let's say I have a support department that needs access to the mailbox with the email address support@mydomain.com. Currently, I have to manually add this additional mailbox for each user individually, but it would be convenient if I could simply create a group called “Support,” add all my users from the support department to that group, and then provision the support@mydomain.com mailbox only for that group. This would also have additional benefits, such as users not being able to remove the mailbox, as is possible with manual addition, and a user who joins the support department can simply be added to the support group and the mailbox is automatically (or with one click) made available.

Describe alternatives you've considered

Adding a service mailbox like support@mydomain.com for each user individually.

Additional context

No response

The issue names no files, tests, or entry points. Start by locating the existing account-provisioning and user-group flows, then trace how additional mailboxes are assigned and removed. Done should cover group-scoped provisioning for a selected mailbox, including behavior for users added to the group and protection from individual removal.