In Web Screen Painter, open 'list_cnt.htmpl' from the Analyst interface and Default form group:

Open the Source view, search for the text 'attr=email_address'. You should find this (this is in r17.1):

The '<PDM_IF...> ... </PDM_IF>' stops the email address field from appearing unless the list is being used to select contacts for a CI. You can suppress this by editing the <PDM_IF ...> and </PDM_IF> to turn them into comments:

Save, publish, log on to SDM and open the contact list - you should see the email addresses:

Now, if you click the 'Export' button, the 'export.xls' will include email address as a column:

Regards,
James