Get information from one module into another

Get information from one module into another

Is there any way to pull an e-mail field from a different module.  I have leads with a vendor assigned to them.  I want to set up notifications that will be sent out to both the lead and the vendor associated with the lead using a workflow.  I have created a look up field and am able to pull the vendor name from the vendor module, but is there a way to pull the the e-mail form the vendor module so i can cc them on the auotmatic notifications being sent to the lead?