Rule/Applescript that pops up a window to check sender in Outlook

I like to find a way to make a rule or Applescript that pops up a window to check sender in a new mail in Outlook.

Using Outlook 2011.

I would like to have a warning appear every time a new email is generated. Reason be, that we have several sender addresses and Outlook does not always take the default address. And yes we humans forget to check…

Does anybody know how to do this and if it is at all possible?

Thanks!