How insane that this isn't an option. It's a literal sort order and I would guess almost 100% of other email clients sort the other way by default or as an option.
Outlook on mobile seems to have finally gotten this, so it must be possible if even MS can get it done.
Honestly, who TF reads email like this? It has to be harder to do it this way as it is an inversion from the immediately preceding list. Top=new -> bottom=new -> top=new -> bottom=new, back and forth.
9 years tells me it refund time, 2 hours in to migrating.

I have searched sooo long for this feature. The only possibility is to deactive grouped conversations! It should be possible to sort them from new to old!

Come on, this REQ is 9 yes old!!!

Agree this is super important.
Many times i get notified about a new email, and by mistake read the wrong email.
This is standard in Gmail /Outlook, and it a major pain point in the Pronton mail usability!!

Otherwise very happy with your services :-)

This feature is common in almost all other email interfaces.
Reasons why this is an important feature include:
- Quick access to what's new.
- Mimics real-time communication patterns.
- Faster decision-making in threads.
- Reduces missed updates.
- Better for processing backlog (Especially with a preview option).

Let's get on the ball here, Proton. There are probably 3rd party options to manage the inbox but I prefer to stay within the Proton ecosystem.

Thanks for sharing, @Skippy.
I don't tend to use those kind of extensions for the reasons you mention (though I notice ViolentMonkey is at least open source), but it does show how simple it should be for Proton to implement this much-requested feature.
Perhaps one of the Proton team could point us to the right place in the Proton Mail GUI code for us to submit a pull request?

Though I too would like to see this implemented. For anyone that stumbles across this comment.... I got it working perfectly on a browser. I know that some users are against using additional extensions because of the security aspect. And I do understand. I however, am happy using a script injector where I trust the extension authors and I know what the script is. I use Violent Monkey extension, which can inject any script into to a page (I've been using it for years with various scripts to click Prime recap buttons, Disney skip to next episode buttons, etc). If you're unfamiliar with TamperMonkey or Violent Monkey, just do some research first. After you install one of those extensions, you simply create a new script and paste the code below in the script. Then, every time I check my emails on a browser, any conversations that are threaded (Conversation Grouping must be "on" in Proton settings) I have the newest email at the top and the oldest email at the bottom. Thanks to Xav Palo who posted in these comments with the CSS code needed to achieve this. Because ProtonMail doesn't have a custom theme option anymore, you can't edit directly, but the script below achieves exactly the same thing.

// ==UserScript==
// @name ProtonMail Reverse Conversation Order
// @version 1.1
// @description Reverses the message order in ProtonMail threads so the newest is at the top.
// @match https://mail.proton.me/*
// @match https://account.proton.me/*
// @match https://mail.protonmail.com/*
// @grant GM_addStyle
// @run-at document-start
// ==/UserScript==

(function() {
'use strict';

// ----------------------------------------------------------
// CONFIGURATION:
// If the script doesn't work, ProtonMail may have changed the
// element ID/Class. Right-click the thread container, choose
// "Inspect", find the class name, and update the selector below.
// ----------------------------------------------------------

const threadContainerSelector = '.pb-custom';

// ----------------------------------------------------------
// INJECT CSS
// ----------------------------------------------------------

const css = `
${threadContainerSelector} {
display: flex !important;
flex-direction: column-reverse !important;
}
`;

GM_addStyle(css);

})();

I am trying to move from another platform and I am utterly disappointed that such a basic UI feature isn’t available. Most recent email is at the top in the second column, and next to it the most recent conversation is at the bottom… makes NO SENSE!

The way conversation grouping currently works makes some conversations extremely long. Having the newest messages on top is becoming a necessity. Please, please add this.

Any updates on this? How can we get this added to the roadmap? I just paid for a 2 year subscription to get out from under M365 email for my wife's domain and she is freaking out because she HATES having the new emails at the bottom. Crazy to me that this has been requested for nearly a decade now without so much as a response from the Proton team.

for anyone that wants this feature now, I made a "userstyle" that makes your new emails in a conversation show up at the top of the list.

https://userstyles.world/style/23371/protonmail-sort-conversations-new-to-old

Really disappointed that something so basic isn't an option after dropping hundreds of dollars on a subscription, specially after seeing that this has been a problem they've known about for over 8 years at least.

Please add this !

This seems such a trivially simple thing to implement that it is frustrating it's taking so long. As a paid (Visionary) user it's one of the things that I have got used to but could potentially make me switch to another provider that did offer it. If I had more time I would be tempted to try to implement this myself - if anyone from Proton Mail is reading and could point me to the right place in the code (I'm assuming it's part of the open source apps as this would be client-side) then I might try to take a look...

I fear that the Proton team doesn't care about improving conversation grouping improvements. This issue was raised in 2017 (!), many more issues with the same topic were raised over the years, and I haven't seen a single statement from the Proton team on how they want to handle the issue.

Proton team, if you read this, this is a deal breaker, so much to consider to move to another mail provider. I want mail, I want security, I want privacy, and I pay for it (and my family!) - please consider fixing this, or at least send a statement about your position about it. Silence is the worst.

Yes 100%! I just opened my energy bill email and panicked seeing my account in -£160 debit until I realised Proton opened the statement from 3 months ago!

If I click on an email, it should open that email, this seems like very basic UX. Whyyyy!?

Just migrated all my emails from google and realised this issue. Proton, please make your service not only secure and private, but user friendly too!

I too, would like this feature and found myself very surprised that its not an option...

I agree, this is what all other email servers offer. I don't want to have to scroll down to see the new responses. They should also have the option to have them all open for view rather than open each one to figure out what the thread is about.

Latest first descending by date Received or Sent in the chain for Individual messages,not a ALL or Nothing approach