How to: Set the ForwardingAddress using a TSV file. (4293403)

We have defined a collection for 2 users who have different SMTP domains. For example :

user1@mycompany.com
user2@othercompany.com

We have a shared name space between Domino and Exchange (no subdomains). We want to use NME to set the Forwarding Address field in the Notes Person Document. As it is a common name space between Domino and Exchange the forwarding addresses for the 2 users are exactly the same as the Internet Address Field.

According to the documentation, you populate the TSV file with a TargetForwardingAddress to be set. So, what options do we use in the wizard to set the Forwarding Address field to the value in the imported TSV file?