The new Proton Mail Bridge is a major improvement

Martin Brinkmann
Feb 22, 2023

Proton released an update for Proton Mail Bridge that promises major performance improvements over previous versions. It is also the first version that is optimized for Apple Silicon on macOS.

Proton Mail users who want to use the secure email service with traditional email programs, such as Apple Mail, Microsoft Outlook or Thunderbird, need to use a dedicated app, called Proton Mail Bridge, to do so.

proton mail bridge interface

Proton Mail Bridge, which we mentioned in 2017 for the first time here on this site, adds end-to-end encryption support for Proton Mail to desktop email clients. Proton Mail is one of the few email services that uses end-to-end encryption and zero-access encryption all the time. The company can't access emails of its customers. This encryption is automatic when Proton Mail users use the web-based version or the Proton Mail apps.

It is a problem if customers want to use other desktop programs, as these do not support the required functionality to decrypt the messages. That's were Proton Mail Bridge comes into the picture. It bridges the gap by introducing the missing support.

Note that Proton is working on a dedicated Proton Mail app for the desktop operating systems Windows, Mac and Linux.

The new Proton Mail Bridge

Proton engineers have developed an improved version of Proton Mail Bridge. It includes "major performance and stability improvements", according to the company's announcement on the official blog.

Proton Mail Bridge is available for Windows, macOS and Linux to all paying Proton Mail customers, but not to Proton Free users. Proton Free is an introductory plan that is free of charge, but limited in functionality and capabilities. It is limited, for example, to 1 free email address and 150 messages per day.

The first commercial plan, Proton Mail Plus, starts at €3.99 ($3.99 US) per month, with options to save up to 24% when subscribing for a two-year period.

Proton claims that the new Proton Mail Bridge application synchronizes inbox data up to 10 times faster when compared to the previous version of the application. Additionally, the sending of emails with large attachments is now up to three times faster than before. Another major benefit introduced by the update is that emails may now be composed and sent right away. Previously, the inbox needed to be synced first before that was possible.

Setting up Proton Mail Bridge on new devices or logging in after a time of absence should now be much faster, according to the announcement.

Behind the scene, Proton engineers developed a new IMAP library, which they called Gluon. This app uses a snapshot-like system, that assigns each email app its own snapshot of the email inbox. Bridge uses the information that is provided to handle all email activity more efficiently. Gluon is open source, and the code is available on GitHub.

Proton has started to roll out the Proton Bridge Update to customers on February 20, 2023. Customers who do not want to wait and new customers, may download the latest version of Proton Mail Bridge from the official website right away to update to it immediately.

The new Proton Mail Bridge is a major improvement
Article Name
The new Proton Mail Bridge is a major improvement
Proton released an update for Proton Mail Bridge that promises major performance improvements over previous versions.
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  1. JMGG said on January 19, 2012 at 8:25 am

    You said that Outlook isn’t your main email client, so which is your main one?

    1. BalaC said on January 19, 2012 at 9:42 am

      I think its thunderbird

    2. Martin Brinkmann said on January 19, 2012 at 10:15 am

      It is Mozilla Thunderbird.

  2. Salaam said on September 24, 2012 at 9:52 pm

    Awesome! This actually solved my problem… what a stupid bug.

  3. Claud said on December 19, 2012 at 2:08 am

    If this is the same bug that I’ve encountered, there may be another fix: (1) hover over open Outlook item in Taskbar, cursor up to hover over Outlook window item, and right-click; (2) this should give you Restore / Move / Size / Minimize / Maximize — choose Move or Size; (3) use your cursor keys, going arbitrarily N/S/E/W, to try to move or size the Outlook window back into view. Basically, the app behaves as though it were open in a 0x0 window, or at a location that’s offscreen, and this will frequently work to resize and/or move the window. Don’t forget to close while resized/moved, so that Outlook remembers the size/position for next time.

    1. Lynda said on February 12, 2013 at 3:37 pm

      THANK YOU Claude!!! I could get the main window to launch but could not get any other message window to show on the desktop. You are my hero!!!!

    2. Chad said on November 20, 2018 at 4:24 pm

      Solved my issue! 6 years later and this is still problem…

    3. Ivan X said on January 21, 2021 at 4:50 pm

      Fantastic. Thank you. Size did the trick.

  4. Andrew said on October 26, 2013 at 7:06 am

    This solved my Outlook problem, too. Thank you. :)

  5. Charles said on December 7, 2013 at 7:23 pm

    Thank you so much, this started happening to me today and was causing big problems. You are a life saver, I hope I can help you in some way some day.

  6. garth said on November 7, 2014 at 7:13 pm

    You are a god – thank you!

  7. Faisal said on February 9, 2015 at 10:09 am

    thanks a lot…. work like charm.. :-)

  8. Simon said on March 24, 2015 at 11:36 pm

    Yah…thanks Claude. I’ve been having the same problem and tried all the suggestions…your solution was the answer. It had resized itself to a 0/0 box. Cheers

  9. Olu said on April 14, 2015 at 1:35 pm

    Excellent post. This had me baffled even trying to accurately describe the problem. This fixed it for me.
    Thank you

  10. Coenig said on July 23, 2015 at 7:36 am

    Thanks a lot for the article. Don’t know why it happenend, don’t know how it got fixed, but it was really annoying and now it works :-)

  11. Fali said on January 20, 2016 at 4:19 pm

    Thanks a lot. I was facing this issue from past 3 week. I tried everything but no resolution. The issue was happening intermittently and mainly when I was changing the display of screen ( as i use 2 monitors). The only option i had was to do system restore. But thanks to you.

    1. MIki said on January 10, 2019 at 11:54 am

      I’ve been tried to sole this problem for 12hours. Your comment about changing the display of screen helped me a lot!! Thanks!!

  12. Christina said on January 20, 2016 at 6:14 pm

    Thank you…don’t know why this happened but your instructions helped me fix it. Running Windows 10 and office pro 2007

  13. Oz said on July 22, 2016 at 3:20 pm

    Great tip! Thanks!

  14. Tracy said on September 1, 2016 at 4:48 pm

    Worked for me, too – thank you!!!

  15. shawn said on September 9, 2016 at 10:25 am

    It’s Worked for me, too
    thank you very much!

  16. Jari said on October 31, 2016 at 11:53 am

    I had a similar issue with Outlook 2013 on Windows 10 and this helped me to fix it. Thank you very much!

  17. Michel H said on November 30, 2016 at 11:08 pm

    Thank you so much. Solved!
    Considering you published this in 2012, incredible not been debugged by Microsoft.
    Thank you again. M

  18. Ziad Bitar said on January 9, 2017 at 2:00 am

    This problem was faced by only one user logging to TS 2008 r2 using outlook 2010.The issue was resolved.


  19. Anonymous said on February 15, 2017 at 5:24 pm

    Great tip. Thank you!!!! If it helps, I had to use the Control Key and the arrow keys at the same time to bring my window back into view. Worked like a charm.

  20. Rochelle said on March 6, 2017 at 11:59 am

    Thank you, this worked !!!!

  21. anom1234 said on May 20, 2018 at 11:20 pm

    Man, you are a fucking god. Thanks a lot, what an annoying bug!!

  22. JC said on October 12, 2020 at 2:14 pm

    Awesome, this post solved the issue. Many thanks!

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