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...er's UIDVALIDITY and message UID numbers to preserve caches. Using dsync preserves these. See doveadm-sync man page. It's also in https://wiki.dovecot.org/Tools/Doveadm/Sync <https://wiki.dovecot.org/Tools/Doveadm/Sync> From your previous mail: > sudo doveadm backup -D -u "${mailbox_username}" "mdbox:/home/vmail/virtualmailboxes/${mailbox_username}_backup" > sudo service dovecot stop > sudo mv "/home/vmail/virtualmailboxes/${mailbox_username}" "/home/vmail/virtualmailboxes/${mailbox_username}_original" > sudo mv "/home/vmail/virtualmai...

Dear Aki, I switched to "gz" now, since "zstd" also gave some errors on writing to files. I dont know if "xz" compression or "zstd" shreddered my MDBOX Files, but I lost 4 days of mail. (a couple of thousand mails). After restoring the backup (what was made after switching to version 2.3.11.3) I still have some broken mdfiles, but not too many. Interestingly

...at am i missing or doing wrong mysql config file db_host = localhost #db_port = 3306 db_unix_socket = /var/lib/mysql/mysql.sock db = ADMIN db_user = mailmaster db_passwd = ******** db_client_flags = 0 default_pass_scheme = PLAIN password_query = SELECT MAILBOX_PASSWORD AS password FROM MAIL WHERE MAILBOX_USERNAME = '%n' AND MAILBOX_DOMAIN = '%d' #user_query = SELECT MAILBOX_ROOT AS home,uid,gid FROM MAIL WHERE MAILBOX_USERNAME = '%n' and MAILBOX_DOMAIN='%d' dovecot config file base_dir = /var/run/dovecot/ protocols = imap pop3 imap_listen = * pop3_listen = * ssl_disable = y...

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 to2.3.10.1 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. >