Exchange retention policy - is it possible to automatically apply to new mailbox

Hi all,

We are using Exchange 2010 (soon to migrate to 2016).

I recently setup a retention policy to automatically delete email in the 'Deleted Items' which have been there longer than a year.

This has been applied to a number of test users and I would now like to roll it out to all users.

Is there a way to automatically apply this retention policy to any new mailboxes that we create?  Or is it a case of having to manually add them?

Thank you