Hi Aki
I wondered, why is my answere here missing in the mailing list and now see that the answer was directly to your email adress. ( i only pressed answer in thunderbird and don't looked a the recipient, so i now use the webui )
My Answer was:
I already tried to deleting of the destination folder. The folder is then freshly created via doveadm, but is unfinished because the backup jobs aborts on the > messages mentioned above. If i don't delete the destination folder, the backup job gives me a clearer error message:
doveadm(user3)<68274></THVECElaWWyCgEAy5X8iQ>: Error: Mailbox INBOX sync: mailbox_delete failed: INBOX can't be deleted.
The other 450 accounts on the server have no issue and doveadm backup works as expected.
I don't have any special namespaces configured on the server or acls. The server is a simple setup, mariadb as user backend and most settings are default settings. I enabled managesieve for filtering.
Also the logfiles on the source server don't give me more hints, what the issue could be.
I also do some tests since then, when i completly remove the folder/mailbox and den start the sync again it's always aborts on a different mail/position
/usr/bin/doveadm -D -v backup -Ru user3 tcp:mua01.zh01.4s-zh.intra:12345
Dec 13 11:03:47 doveadm(user3)<150241><jksWEI6PeWXhSgIAy5X8iQ>: Debug: brain M: Import Archives.2022: Import change type=expunge GUID=<unknown> UID=7 hdr_hash= result=Expunged mail not found locally Dec 13 11:03:47 doveadm(user3)<150241><jksWEI6PeWXhSgIAy5X8iQ>: Warning: Deleting mailbox 'Archives.2022': UID=8 GUID=1659511136.M535616P21860.mail1.intra,S=4965,W=5057 is missing locally Dec 13 11:03:47 doveadm(user3)<150241><jksWEI6PeWXhSgIAy5X8iQ>: Debug: brain M: Import Archives.2022: Import change type=save GUID=1659511136.M535616P21860.mail1.intra,S=4965,W=5057 UID=8 hdr_hash= result=Reverting local change by deleting mailbox - No more local mails found Dec 13 11:03:47 doveadm(150241): Debug: brain M: Import Archives.2022: Saved UIDs: Dec 13 11:03:47 doveadm(150241): Debug: auth-master: conn unix:/run/dovecot/auth-userdb (pid=661,uid=0): Disconnected: Connection closed (fd=9)
or
Dec 13 11:09:47 doveadm(user3)<150308><amjnGveQeWUkSwIAy5X8iQ>: Debug: brain M: Import Archives.2023: Import change type=expunge GUID=<unknown> UID=1 hdr_hash= result=Expunged mail not found locally Dec 13 11:09:47 doveadm(user3)<150308><amjnGveQeWUkSwIAy5X8iQ>: Warning: Deleting mailbox 'Archives.2023': UID=2 GUID=1681916185.M428555P22295.mail1.intra,S=160923,W=163399 is missing locally Dec 13 11:09:47 doveadm(user3)<150308><amjnGveQeWUkSwIAy5X8iQ>: Debug: brain M: Import Archives.2023: Import change type=save GUID=1681916185.M428555P22295.mail1.intra,S=160923,W=163399 UID=2 hdr_hash= result=Reverting local change by deleting mailbox - No more local mails found Dec 13 11:09:47 doveadm(150308): Debug: brain M: Import Archives.2023: Saved UIDs: Dec 13 11:09:47 doveadm(150308): Debug: auth-master: conn unix:/run/dovecot/auth-userdb (pid=661,uid=0): Disconnected: Connection closed (fd=9)
On the source server it looks then like this:
Dec 13 12:09:44 mail1.intra dovecot: doveadm: Debug: brain S: Mailbox Notes: local=ebb1da135a923659d72400009c0bcd07/0/1, remote=00000000000000000000000000000000/0/0: mailbox not selectable yet Dec 13 12:09:44 mail1.intra dovecot: doveadm: Debug: brain S: Mailbox Sent: local=8d6c930873a63459521600009c0bcd07/0/1, remote=00000000000000000000000000000000/0/0: mailbox not selectable yet Dec 13 12:09:44 mail1.intra dovecot: doveadm: Debug: brain S: Mailbox Sent Messages: local=3d9ceb18dae35f59753a00009c0bcd07/0/1, remote=00000000000000000000000000000000/0/0: mailbox not selectable yet Dec 13 12:09:44 mail1.intra dovecot: doveadm: Debug: brain S: Mailbox Spam: local=03b2da135a923659d72400009c0bcd07/0/1, remote=00000000000000000000000000000000/0/0: mailbox not selectable yet Dec 13 12:09:44 mail1.intra dovecot: doveadm: Debug: brain S: Mailbox Trash: local=0c644e24dad134593b6b00009c0bcd07/0/1, remote=00000000000000000000000000000000/0/0: mailbox not selectable yet Dec 13 12:09:46 mail1.intra dovecot: doveadm: Debug: brain S: Skipping unchanged mailbox 40303c0fb2fc015d9c6d0000b5363f5c Dec 13 12:09:46 mail1.intra dovecot: doveadm: Debug: brain S: Skipping unchanged mailbox cf131a0513dd926057390000449ae907 Dec 13 12:09:46 mail1.intra dovecot: doveadm: Debug: Mailbox Archives.2022: Opened mail UID=8 because: prefetch Dec 13 12:09:46 mail1.intra dovecot: doveadm: Debug: Mailbox Archives.2022: Opened mail UID=8 because: access Dec 13 12:09:46 mail1.intra dovecot: doveadm: Debug: Mailbox Archives.2022: Opened mail UID=8 because: mail stream Dec 13 12:09:46 mail1.intra dovecot: doveadm: Debug: Mailbox Archives.2022: Opened mail UID=10 because: prefetch Dec 13 12:09:46 mail1.intra dovecot: doveadm: Debug: Mailbox Archives.2022: Opened mail UID=10 because: access Dec 13 12:09:46 mail1.intra dovecot: doveadm: Debug: Mailbox Archives.2022: Opened mail UID=10 because: mail stream