onleedesk will tunr you Gmail™ mailbox into shared mailbox. With onleedesk you can share your inbox with colleagues no need to delegate or transfer emails, juste share and we will replicate all emails received in your colleagues mailbox.

Main features :
Share inbox with up to 5 people (for launch)
Sycnhronize emails received
Synchronize reply from colleagues mailbox
Work event if your domain don't allow email forwarding*
Share just a label, label must be an automatic filter

(1) Note for user, this add-on require to be installed by your G Suite Admin first. Please reach him before to be able to use it.
This add-on is not for Gmail.com users.