Mail - Scheduled Deletions

I would find it very useful to be able to schedule the deletion of emails. Either by a quick button, much like setting reminders, except the drop-down would have much bigger time increments:

1 week
30 days
60 days
90 days1
180 days
1 year

It would also be great to have access to these from filters. Receipts, POs, Invoices... often all need to be retained for a certain period of time but then become irrelevant (at least the email version does).

For me, everything order confirmation can be deleted after 60 days. By that point I have received it and know whether it was billed correctly and whether the product needs to be returned.