Use Google Groups as a shared inbox

[Zino49]

Hello Google Community,

I have what I believe is a straightforward requirement, but I'm struggling to find a solution.

In our organization, each user has their own Gmail address. Additionally, we use Google Groups for collaborative work within the Google Groups for Business interface. These Google Groups are also used for communication with external customers, and we want to ensure that replies to these emails are sent only from the group email address to the original sender.

So far, I have set up the group as a Collaborative Inbox and configured the "Who can post as the group" setting to allow group members to post. However, it seems that we are only able to reply to emails within the group interface by either:

1. Replying to the group itself with the original sender as a CC, or
2. Replying directly to the group.

What we need is the ability to respond directly to the external sender from the group's email address, without having to switch to the Gmail interface. While we know it's possible to send emails from the group's email address via Gmail, switching between interfaces is not efficient for us.

Any advice or solutions on how to configure this would be greatly appreciated.

Thank you!