This is a pretty standard policy at larger companies. Part of the reason is that even if everything in the emails is 100% legally fine, discovery is _expensive_

This is a pretty standard policy at larger companies. Part of the reason is that even if everything in the emails is 100% legally fine, discovery is _expensive_ and gets more expensive the more emails exist. This explanation was given to me by a corporate lawyer who was trying to figure out whether the same kind of expiration could be put on tickets in bug and project trackers, which would have been even more harmful to institutional memory than an email expiration policy.