Sending E-Mails Using Macros - Populate To and CC

I am just learning how to use the SendObject command to automate a few
emails. I have a project tracking database that I built and I would like to
use the SendObject in a macro as a button on a form that will automatically
generate an update to the affected constituents. I have the email addresses
stored in a contact table, and I would like to perform a lookup in the macro
to automatically pull these email addresses into the To as I select them on
my form. When I try the typical string ([forms]![form name]![field]), the
macro can't populate the recipients, only populates the string in the To
field. Any ideas?