How to access the value of a referenced node's field to use it as a Rules action? I have a content type A that has a node reference to type B.  Type B has an email address field that I would like to use in a Rules Action.  How do I get the value of a referenced node's fields?  

Note: After much searching, I tried the steps Link suggested in Rules: Do action on the field of referenced node, but after adding the Entity has Field condition on my node reference field, there are not any replacement patterns like node:node_reference:field_email, just the normal node:field_email.
Try adding a Rules Action (as the very first action) like "Fetch entity by id", which in your case is probably something like node:node_reference:nid.

This should make the data available from the node that is referenced via your node reference field.