Use shared Sent folder with replies to shared mbox

[aidan]

Hi,

This is something I cannot figure out for the life of me. My current situation is that we have a shared mailbox (e.g. help@example.com) that the support team (user1@example.com, user2@example.com) has access to through ACL. Each folder from the help user is shared to the team. Yet, when user1 replies to a message in the shared Inbox from help, user2 cannot see the reply because the messages are copied to the personal Sent folder for user1. Is there any way to specify a second sent folder that replies to the shared inbox get copied to? Is there a plugin? Or will I have to build this solution myself.

Much appreciated.