It blows my mind that this feature request is so low in terms of votes. I guess most people are using single user licences.
Regardless, this is a game changer for everyone on Duo, Family or Business.
We don't want this, we NEED this.

Lack of this feature is the main reason I’m not paying for the duo plan.

This is critical! I have just signed up for a Duo account, and I am reconsidering it just for this feature! Couples need to be able to share and manage one same email address from both accounts!

So when checking this again, I find out Proton actually has the feature, but reserves it exclusively for Business accounts: https://proton.me/support/groups

So for twice the price you can finally get a feature that is essential for every +1 person household. Odd strategy.

*@custom.domain -> shared inbox

*@person1.custom.domain -> person1 inbox

*@person2.custom.domain -> person2 inbox

Would be great

A delegated inbox feature would be a game-changer. I am trying to move a nonprofit to Proton from Google but I think the lack of a delegated inbox will be a deal breaker. This is also an issue for our personal family plan.

Also needed for family and business.

For anyone looking for an alternative solution: Using SimpleLogin you can create an alias that gets delivered to two mailboxes (e.g., you and your partner). If either of you replies to the simplelogin reverse alias then it will be forwarded via the original alias, so both of you have the ability to both receive and send from the same address. IIRC it even sends a copy to the other mailbox!

I'd consider using Duo if this was an option.

The accounts that currently use my free joint protonmail include our joint bank account, our household internet subscription, some arts & entertainment lists, water company, property tax reminders, etc. However, I'm the only one paying attention to it so it really isn't "joint" at all. I think a proper Duo account would make it possible for us to each login to our individual email and, with an easy switch accounts action, the joint one, too.

This is absolutely critical to maintain Proton Duo as a feasible product offering for a tech/security focused household.

Each partner has their own independent custom domain and would like to use a third shared custom domain to manage the household with ease. In cases of urgency or emergency, one partner should be able to send emails from the same address in a unified inbox/folder system without having to login to their partner's user account.

I paid for a duo plan thinking I could create a shared email address that both my wife and I could use.Very dissapointed that this is not the case., Are you considering this option?

Come on Proton, get with the program. People have been asking for this for ages, and now that so many of us are dying to move away from US services like Google this is the one missing link.

Our household effectively runs on a share email address (currently via Google Groups). We can't do without it.

Shared inbox and email-folders should be possible for family accounts, just like it is possible at Tuta email! I am considering to upgrade to duo, but I was very supprised that shared emil-folders not is possible!

My wife and I have shared an additional Gmail account together for years, used for anything we'd both need to manage for our home. We're now both migrating to Proton and this would effectively allow us to move the rest of our joint emailing over to this service as well.

My wife and I also need this feature - with the ability to both receive and "send as" the joint address.

Lack of this feature is the last thing tying us to Google's email service.

We paid for the duo plan specifically because we thought we would be able to create joint emails under our domain name. I am baffled that this is not a feature.

This is critically important. Creating a free account for joint mail is not a solution because forwarding is not possible for free accounts. The only real solution is to use a free Gmail account which does support forwarding -- but this solution is absurd, as it nullifies all of the privacy of the paid Proton account.

As another commenter said, I was happy with a simpler solution before:

- 2 emails, one for me and one for my partners
- 1 "shared" email, which we can use to send the reply to the two personal emails.

It's not perfect, but a "send as" and a forward did the trick for ages on Gmail, and now I use a third party service for forwarding, but I'm constantly fighting with the MX records.

Part of the reason for signing up to duo was to enable us to transfer over to a new joint email on this platform.