Chrome Extension to automatically add BCC in Gmail

We manage several email accounts through a Gmail interface. When we reply to a message from a particular account, we want copies of the reply to be sent to designated email addresses as a carbon copy (Cc:) or blind carbon copy (Bcc:). We are looking for an implementation as a Google Chrome extension that works on both Windows and Mac platforms. ## Deliverables The extension needs to allow for: 1. Different destination addresses for different accounts. 2. More than one destination address for each account. 3. A way to set up and modify the destination addresses through the standard Extensions options interface. 4. Should be triggered no matter how the message is initiated: pressing buttons for Reply, Reply All, Compose, Forward, etc. or if initiated by one of the Gmail keyboard shortcuts 5. Must support the Gmail Labs feature for the Send and Archive button