When using the email feature and selecting a recipient, the only addresses that appear are those in the Customer and Vendor Contacts. The email addresses that are on Billing pages, shipment pages and location pages do not appear.
Similarly it would be good if one first adds the contacts to the customer and then select the email address for billing, shipping, location etc. Same with Vendors. At the same time the system could add the type of contact "Billing", "Main" etc.