If no one at your installation intends to use vi, a superuser can get rid of the exrecover mail messages as follows:

1. Edit /etc/rc
2. Comment out the line that says /usr/lib/exrecover. This stops the exrecover command from running, so no new mail messages will be sent.
3. cd /tmp
4. rm VI*

If your installation has some users who will be editing with vi, then it's a little trickier. In this case, your vi users will want the recovery capabilities of vi, so you do not want to remove the exrecover command from /etc/rc.

Anyone can remove those /tmp/VI* files that were generated when users on dumb terminals tried vi. To stop exrecover from sending new mail messages about those files:

1. Broadcast a message to make sure no one is using vi at the moment
2. cd /tmp
3. rm VI*