On Sat, Jan 24, 2026 at 10:26:30AM -0500, John Hill via dovecot wrote:
I have yet to update Debian due to this. I did install in a test site and spent the better part of a day getting it to work, hopefully.
For Debian, I'd recommend reading chapter 5.1.18 of our finde release notes for trixie. I have updated my mail server to trixie a few weeks ago and found the information the dovecot project gave about how to convert very helpful and understandeable. It took me about two hours to figure out the changes, but my IMAP system also only has a handful of users. For everything of production value I'd strongly recommend to practise this upgrade with an offline clone to minimize downtime.
You cannot blame a software project for moving forward. If you want to see how software looks after keeping backwards compatibility for two decades, take a look at a random Windows system.
The dovecot 2.3 to 2.4 upgrade surely is not painless and definetely causes manual work and testing efforts that I'd rather not have had done, but I also experienced more painful transitions in the past.
That being said, I found the thread starting message disrespectful and unfriendly and would rather not read something like that again on the support mailing list of a free and open source software project.
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