Can I build a table that will do the following:

If name is Jeff then email_address is jeff@domain.com else if name is Bob then email is bob@domain.com?

Just out of curiosity, what is it you're trying to do this for? If it's for the ability to allow different people to get the emails depending on a choice, that's built into the program already. If that's not what it's for can you humor me and tell us what this would be for please so we can better answer your question.

I have a captive set of users, 10, and have their names setup in a drop down, now I would like to associate an email address based on their name. Does not need to display email in form, but would prefer not to prompt for their emails

I'm going to assume you are trying to use the dropdown as a sort of contact list for people that fill out the form? If so then this should help.
http://www.coffeecup.com/help/articles/ … m-builder/

If you're trying to do it some other way we would need a bit more information on what the form is going to do when their names are selected in the drop down. My guess is that the above link should take care of what you're trying to do though and no email addresses should show on the form (not sure if they won't show in the code though).