Choose recipients per document type for company contacts

Problem: A contact can only have one email, and sending a document auto-includes every email on the project’s contacts. Purchase orders and quotes end up at accounting instead of the project manager or superintendent, and some people receive emails they shouldn’t.
Request: Allow multiple emails per contact (e.g., accounting, PM, superintendent) and let the user choose recipients per send, or set a default recipient per document type (PO, quote, invoice).
Impact: High. Clients have received negative feedback from their own customers and want a fix quickly.