Re: Catch-alls are a bad idea...
Our system policy is to keep a copy of everything that goes in or out - this is a requirement in some environments and a lot more common than you might think. The backups are deleted automatically (also policy) after 90 days and very occasionally I have to look through the backups to retrieve a specific message based on Subject and Time.
So I could look at a lot of stuff but I don't - it's none of my business unless there is some requirement to do so - I sleep well at night.
Catch-alls, backups and network traps are legion - have we not learned that yet? If you are doing anything that you don't want published - then don't leave a record.