Hi there,
I could build you a plug-in for Outlook (are you using 2007 or 2010, or another version?) that would add a button to your toolbar when you have an email open. I can scan the body, extract all email addresses located and set up a new mail prepopulated with those emails.
From your brief, I'm not sure what you'd want in the body of the new mail, will you be populating this manually or will it come from a template?
I've built a number of Outlook plugins before, so I know how to do this and it shouldn't be a problem. Please do take a look at my profile for recent reviews of my work. I'll only ask for payment once I've delivered the solution and you're happy with it.
Regards
Chris
PulseLab Ltd (UK)