Am 28.08.25 um 15:15 schrieb Noah Meyerhans via dovecot:
Yes, these packages are provided by Dovecot and may have a different support lifecycle from those provided by Debian.
In general, I'd expect the packages distributed by Dovecot to work on newer distro releases. The package manager will not remove any dependencies as long as the packages remain installed. The main concern is the case when some package from the new distro version conflicts with an older version (that is, they can't both be present on the system simultaneously). You'd likely have already run into this if you've upgraded to trixie, though. Any updates to the Dovecot packages will still be installed as expected.
I don't have any experience migrating (in either direction) between the Dovecot-provided packages and the Debian-provided packages, so if you do pursue that course, be sure to test thoroughly before going to prod.
thanks @noah for this information
So far two servers run fine with this combo of trixie + 2.3 packages from dovecot-repo (for me)
As mentioned I plan to do the step to dovecot-2.4 as soon as possible, after figuring out the config changes and testing them as good as I can.