I believe this can all be achieved with folders & filters. For example, let’s say you want foo@proton.me to go to one inbox, and bar@proton.me to go to another:

1. Create two folders, such as “Foo Inbox” and “Bar Inbox”. You can name them however you want and sort them to appear at the top of your folder list if desired.

2. Create a filter rule: if recipient is foo@proton.me, then move it to Foo Inbox. Do the same for bar. These automatically run for each email when it’s received.

This approach works for custom domains as well.

Similarly, Proton lets you to append ad hoc labels to email addresses, such as foo+label@proton.me, and create filter rules to automatically file or label them as they’re received. This can be used on top of any filters you setup for multiple inboxes, so you have lots of options.

Is your request to make this type of setup easier (eg a single checkbox that automatically creates the additional Inbox folders and filter rules), more intuitive (eg it might not be obvious that filters can be used for this purpose), or perhaps to have a different UI design for day-to-day use of multiple mailboxes (such as different windows, panels, login states, etc)?

This seems like yet another feature (NOT) with Protonmail. There is far too much emphasis on wonderful new technical features behind the scenes, with far too little work done on the interface e.g. as well as the lack of the actual subject of a calendar entry in the notification Email, we have this lack of multiple inboxes. Day to day, in fact minute to minute it is the Email client that people work with, it is about time that Proton did some work on this, as like others I too will give up my paid subscription before too long.

Regards...

Agreed! I will Stop using protonmail by next year if this is not implemented. Sad but true. I just cant manage my company as easily without this. Simple.

It's now been a year and a half, and this still isn't an option. I run a business, and I need multiple mailboxes to manage the flow of emails. This should have been baked into the design of Proton from the start, since it is not a new concept (hint, it's a several decade old feature).

How is using a 3rd-party solution (Outlook, Thunderbird, etc.) in conjunction with the Proton Mail Bridge the only available solution?

Gmail’s “multiple inboxes” feature has become invaluable to keeping emails that need my attention at the top of my inbox in a separate pane. Currently the rule that I have established for the additional inbox pane that shows at the top of my screen before the rest of the inbox is that any message I star and any draft I have started and not sent will appear there so I can track them as pending until they are complete. This is the main reason I have not moved my business account over to Proton and only have a free personal account. This is a dealbreaker, as this feature keeps me from letting emails slip through the cracks.

I also agree with the general premise. I just added a custom domain to protonmail and sent a test email to the account I created with it. I received the email in my general inbox and there is no way to identify that it has been sent to the account in question until I open the mail to check. It would be great to have a separate inbox/folder/label/color, or anything to distinguish it from mail being sent to the default protonmail account.

I'm in the exact same boat. However multiple inboxes isn't necessarily the request here, that is just what gmail calls it. The main idea is ability to have multiple "panes" for showing folders or labeled emails that are no longer in the inbox.
E.G. moving and email to a "todo" folder to get it out of the inbox but still be able to see it on the main screen without having to navigate to the "todo" folder.
This is also the main issue preventing me from fully moving over from gmail to proton.

This is also a main feature I'm missing: to set up multiple inboxes according to labels. This tutorial from Jeff Su is how I set this up: https://www.jeffsu.org/inbox-zero-tutorial-for-gmail/

I would love to have an Inbox for each address. I have a business domain and also a personal domain but one inbox gets emails from both. So if I send or reply to the a business email I can accidentally reply with my personal. I appreciate one place for everything but it's easy to overlook the drop down menu to select the correct email address.

I receive all kinds of Email, for example...

• General subscription stuff from say Which magazine, ASUS computer stuff etc.

• General info from say Neighbourhood Watch

• Personal Emails

• Notification of purchases and info on the progress to me

I like to have all Email quickly set as read (in a single Inbox so that see there is Mail means its new so read it) but that means remembering which I need to look at again once they are read as opening them sets them as read, i.e. my criteria for a clean inbox. I don’t want to manually file things as then its down the page off-screen etc.

What would be good rather than opening a new tab for a new instance of Proton mail would be to have several inboxes {all visible} (NOT folders that mail is filtered into when it arrives) but within the same instance and visible all the time and be able to automatically filter mail into these inboxes as it arrives.

I could then ensure that personal was always answered, but have subscriptions, information etc. with stuff set as unread (or not) so look at separately

(PS This box for typing in is a real PITA as it can't be stretched to see all my typing)

So multiple Inboxes all visible and mail filtered into them as it arrives.

Regards…

I'm paying for an account with multiple domains and email addresses, I'd like to be able to set up two inboxes, one for business (with my business email addresses) and another for my personal. I don't need multiple accounts, I'd like all my email to live under the Proton Mail roof.