unfortunately after re-installing 2.3.11.3, those broken-pipe errors appear again. (on different, new files)
so for sure there is something broken with zlib.
I will go back to 2.3.10.1 now.
attached is the configuration file, though it did not change between 2.3.10.1 and 2.3.11.3

Robert

Am 26.08.2020 um 09:42 schrieb Robert Nowotny:

I had 4 broken mdbox files for 4 different users.
After deleting them, dovecot re-indexed, now everything is ok again.

I can try to update tonight again to 2.3.11.3 and see if some broken files will appear again tomorrow.

Am 25.08.2020 um 14:51 schrieb Aki Tuomi:
On 25/08/2020 14:35 Robert Nowotny <rnowotny@rotek.at> wrote:


I get ZLIB Errors after dovecot upgrade from 2.3.10.1 to 2.3.11.3


 Aug 21 15:27:34 lxc-imap dovecot: imap(acsida)<63870><jZk...>: Error: Mailbox Sent: UID=40826: read(zlib(/home/vmail/virtualmailboxes/acsida/storage/m.2409)) failed: read(/home/vmail/virtualmailboxes/acsida/storage/m.2409) failed: Broken pipe (FETCH BODY[])....
 
 many of those entries....
 
 after installing2.3.10.1 those files are still broken - but new files are working again.

 anything I can tweak or do ? 
 
Hi!

Is it possible your mdbox file is corrupted? Can you share doveconf -n?

Aki