This is a proposal to implement a feature that will do either or both of these things.
a) Shoot off an email to a member telling them that their PM box is approaching it's limit. Maybe once the box is 5 to 10 messages from it's limit?
b) Pop up a window that will alert the user when their PM box is approaching its limits.
This would be to eliminate the need for people to post messages in the community forum instructing fellow members to "EMPTY THEIR PM BOXES!!" ...
~x2