how to save the From, To: and Cc: fields in env. vars ?

The subject says it all. I want to write something like

FROM=<value of From field>
TO=<value of To: field>
CC=<value of Cc: field>

How do I write this precisely ?

I want to have these values in environment
variables, for I want to call an external program with
them as parameters (and also with the value of FOUND,
mentionned in previous posts).

Thanks,

Denis Roegel