Can you setup a folder for certain emails to go ?

[Chris]

I want to reduce the setting number on my SA but I want
to be sure I'm not gonna be missing any legit emails
because of it.  Is there a setup that you can do so
that you cam lower the setting and all of the emails
affected by that go into a folder, for say 3 months,
then you can look into the folder after that time and
if you see no legit emails, it means that you probably
chose the correct setting.

Any ideas ?

Chris.