Update Virtual Attribute with the list in "UPN Suffix"

Hi i try to update a virtual attribute that must contain the list of the UPN Suffixes...

now i don't want to put them in always manually, but get updated as there is a new UPN Suffix from the Exchange or AD Team.

I would put that in the Policy as script, before the virtual attribute is shown on the Webfrontend when the Admins enter a new email alias for the user, so the list is always up to date.

Has someone a script or an idea?

kind regards

Pablo