Auto CC specific people at some contact persons

Discussed with Zendesk Sell Customer Advocacy Specialist, who discussed the item with Sell Engineers. No solution for now, request is to put the item on the feedback page.

Issue

We have a lot customers who mails us using their own personal mail address. They also put their ‘general purchase department mail address’ (like purchase@company.com) in the CC. 

They except from us that when we mail those people, we also include the purchase address in the CC.

In Sell, when I am at a contact-person-profile, I can sent an e-mail from there, but now there is always only one mail address in the ‘to’ line. Its the personal email address. 

What we would like to have is a solution, like:

• Some kind of a connection between a contact person, and some kind of a ‘purchase department contact person’, which always will be in the CC
• Add a second mail address to a contact person, which will be included in the ‘to’ or ‘cc’?
• Something else