The outage a while back and this do worry me a little bit, but for me it's not enough to switch as I don't use the bridge, it has worked really well for me, and don't really like the alternatives for various reasons. I switched to Proton a few months ago, I quite like it. We’re confident that this addresses the main sources of desynchronization and will be available in the beta version of Bridge by the end of the year. We have doubled the size of the team working on this this year so it is a priority for us. The only possible solution is writing a new open-source IMAP library which we can maintain ourselves to ensure this class of errors cannot occur again. You can follow the progress of this open-source project here: Therefore, the solution is to build our own IMAP library called Gluon, which we have been focusing on since this issue was reported to us. Unfortunately, there are no FOSS IMAP libraries that are sufficiently well maintained.
Addressing this issue at the source requires replacing the core IMAP library. If you find you are missing an email, our implementation works around the issue by placing it in a users’ All Mail folder.Īs Bridge is open source, updates on this issue have always been publicly posted on GitHub. Our implementation tries as hard as possible to avoid this.
There are cases where a combination of a desynchronized mailbox and a specific series of user actions can lead to accidental email deletion, but this is far rarer than desynchronization. Our error tracking shows this does not happen often (1-2% of Bridge users) and the symptom is usually incorrect display of messages or read/unread status which is fixed with an inbox resynchronization. Unfortunately, there are hundreds of email clients, and some email clients don’t handle errors properly, and this leads to desynchronization. When there are network issues, this library returns errors to email clients. Bridge is open source, and as a result relies upon open-source components, and the root cause is an architectural issue in a library that Bridge uses to implement IMAP. The fact that Bridge and its client can become desynchronized sporadically for some users is a high priority issue we have been working on.
For clarity, the issue mentioned here only impacts Proton Mail Bridge, our desktop IMAP/SMTP gateway to Proton Mail encrypted email.
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