Outlook 2010 - Find messages which have gone address A, but not address B

[Frazer]

Hi all,

Always gotten great help from everyone here so wonder if anyone can help me with this predicament.

When emailing one of our contractors via Outlook, we are supposed to send messages to 2 email addresses simultaneously (for the sake of arguement, and for security I'm going to call these address1@abcd.com and address2@abcd.com).

I'm trying to use the advanced search function within Outlook, but it keeps returning messages which don't meet the criteria that I think I'm setting:

Anyone know if I'm doing something wrong here? It's usually something blatantly obvious...

Thanks in advance

 

[Frazer]

I just noticed I should have mentioned what I'm looking for. It transpires that some people have only been mailing address1, so I need to find messages which have only been sent to that address.