HackerReposA FIELD GUIDE TO OPEN SOURCE
ProSponsor the shelf♧ 0
← Back to top all-time
emersion
hydroxide
Go2017–2025
emersion / hydroxide · Archived

hydroxide

A third-party, open-source ProtonMail CardDAV, IMAP and SMTP bridge

6Distinct people
9Mentions
0Explicit recommenders
2.2KGitHub stars
REPOSITORY AT A GLANCE

What to know before exploring

What it is

A third-party, open-source ProtonMail CardDAV, IMAP and SMTP bridge

GitHub

Where it is used

No documented product use has been verified yet.

What people are saying

No recommendation phrase was found in the indexed comments.

No classified warning is attached to this page. Read the discussions before treating silence as approval.

Also in these discussions

No other repository is repeatedly linked in the same discussions.

This week on Hacker News

Nov 7–Nov 14 UTC · Direct repository links and separately labeled related project stories. Indexed through 11/14/2026, 12:54:37 PM UTC.

No direct repository links were found in the indexed HN discussions over the past seven days. Older discussions are available below.

Mentions over time

HN mentions by year9 dated mentions

Observed mentions: 2017-11-27 17:28:13 UTC to 2025-05-02 03:05:26 UTC.

01232017-01-01 00:00:00 UTC to 2018-01-01 00:00:00 UTC (exclusive): 1 mentions; 1 submissions, 0 comments20172018-01-01 00:00:00 UTC to 2019-01-01 00:00:00 UTC (exclusive): 1 mentions; 0 submissions, 1 comments2019-01-01 00:00:00 UTC to 2020-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2020-01-01 00:00:00 UTC to 2021-01-01 00:00:00 UTC (exclusive): 3 mentions; 0 submissions, 3 comments2021-01-01 00:00:00 UTC to 2022-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments20212022-01-01 00:00:00 UTC to 2023-01-01 00:00:00 UTC (exclusive): 2 mentions; 0 submissions, 2 comments2023-01-01 00:00:00 UTC to 2024-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2024-01-01 00:00:00 UTC to 2025-01-01 00:00:00 UTC (exclusive): 0 mentions; 0 submissions, 0 comments2025-01-01 00:00:00 UTC to 2026-01-01 00:00:00 UTC (exclusive): 2 mentions; 1 submissions, 1 comments2025

Counts come from the repository’s dated source evidence. Index cutoff: 2026-11-02 08:16:59 UTC.

View mention counts and date ranges
UTC ranges include their start and exclude their end. Select a period to filter the source evidence.
PeriodStart (UTC)End (exclusive, UTC)MentionsSubmissionsComments
20172017-01-01 00:00:00 UTC2018-01-01 00:00:00 UTC110
20182018-01-01 00:00:00 UTC2019-01-01 00:00:00 UTC101
20192019-01-01 00:00:00 UTC2020-01-01 00:00:00 UTC000
20202020-01-01 00:00:00 UTC2021-01-01 00:00:00 UTC303
20212021-01-01 00:00:00 UTC2022-01-01 00:00:00 UTC000
20222022-01-01 00:00:00 UTC2023-01-01 00:00:00 UTC202
20232023-01-01 00:00:00 UTC2024-01-01 00:00:00 UTC000
20242024-01-01 00:00:00 UTC2025-01-01 00:00:00 UTC000
20252025-01-01 00:00:00 UTC2026-01-01 00:00:00 UTC211

What Hacker News says

9 sources
_lvbh·May 2, 2025Submission

Ask HN: AI for maintenance of open source abandonware?

I've been thinking about this over the past few days - If AI is as capable as people here claim - enough to replace junior or intermediate developers - could it be used to maintain semi-abandoned open-source projects? There is a fair number of abandoned OSS with 1 or 2 major issues that prevent them from continuing to work and isn't too difficult to fix - just requires time. If users pooled context (issues, code, docs) and tokens, I'm inclined to believe an AI agent could resolve them. Here's an example: hydroxide [0] is a ProtonMail to IMAP/SMTP bridge that no longer works due to upstream API changes [1]. Working implementations are available, just in a different language [2]. All an AI would have to do is reference the current implementation and the alternative implementation, then migrate over to the new API format. Perhaps use an mit
Read the rest
mproxy MCP to verify that the requests made are identical. Overall, not a very difficult problem and I can probably do it myself given a few days. Human engineering hours are quite expensive though and for such a low value task, I would assume an AI agent would be more cost effective. Is anyone working on a similar problem/premise? [0] https://github.com/emersion/hydroxide [1] https://github.com/emersion/hydroxide/issues/304 [2] https://github.com/opulentfox-29/protonmail-api-client/blob/master/src/protonmail/…
3 points · Open discussion
For those who like using other mail clients there is the official Protonmail Bridge[1] (for paid customers). There is also Hydroxide[2] (which I use). I am able to use Apple Mail on mobile, Aerc[3] command line mail client on desktop (MacOS and Linux), and sync with the CardDav instance for contacts. Understandably, this is not an ideal solution for everyone -- it works awesome for me! Just a PSA for those not aware. [1] https://proton.me/mail/bridge [2] https://github.com/emersion/hydroxide [3] https://aerc-mail.org/
In Updated Proton, Unified Protection
That is a very interesting claim on their part considering that they hold the private PGP keys used by their service. I'll have to figure out what they mean by this. Edit: Ok I see. They store the PGP keys encrypted with your password. Like you said, they could just as well inject javascript to phish your password from your session. But this does seem to mean that if one uses their API directly it would be possible to securely use their service. Thanks for the heads up. There is a third party open source bridge that reverse engineers their API. I think I will look into it to see how authentication is done. https://github.com/emersion/hydroxide
In More people are searching for an inbox that protects their privacy

MAKE YOURSELF AT HOME

A few shortcuts

/
Search the collection
?
Open this guide
Esc
Close dialogs and navigation

Your saved repositories and interests stay in this browser.