Is there a way to capture the email address or domain information from EmailXtender and map it back to a Documentum repository?

We have EmailXtender setup and have successfully mapped information via ECIS to Documentum and it works great. However there is a requirement to capture the email address or domain information from EmailXtender and map that back to the Documentum repository as well. As of now, I cannot find a way on how to accomplish this. I appreciate any help regarding this matter.