Alias Addresses

Hello!

We had a name change and are working on including our branding within our emails. So we have 3 different domains we can send from. I have not been able to find a solution for specifying which alias address we are including when we are CC'ing each other out to outside vendors/partners. For example, we want to email email address removed for privacy reasons and are trying to include email address removed for privacy reasons however it changes it to email address removed for privacy reasons. We are able to successfully specify which email we send from but it is important that we use the right emails for the other people included in the email chain.