Hi,

Maybe the following additional information can help in debugging... The error messages were:

Oct 18 07:35:58 dovecot: IMAP(user): UIDs broken with partial sync in mbox file /var/mail/user Oct 18 07:35:58 dovecot: IMAP(user): mbox sync: UID inserted in the middle of mailbox /var/mail/user (15314 > 9604, seq=5, idx_msgs=224) Oct 18 07:35:59 dovecot: IMAP(user): file mbox-sync-rewrite.c: line 405 (mbox_sync_read_and_move): assertion failed: (need_space == (uoff_t)-mails[idx].space) Oct 18 07:37:42 dovecot: IMAP(user): mbox sync: UID inserted in the middle of mailbox /var/mail/user (15314 > 9604, seq=5, idx_msgs=224)

• We just switched from UW-IMAP to Dovecot, so the mailbox has been created by UW-IMAP.

• It doesn't help if I delete the dovecot indexes and kill the user's dovecot process.

• It doesn't help if I copy all the mails singularly from the old folder to a new folder (with mutt).

• It helps to move the folder away and start with an empty folder.

Maybe it has something to do with the X-UID headers by UW-IMAP? I noticed that the folder contains mails with duplicate X-UID headers.

Attached is the output of 'grep X-UID /var/mail/user'.

Next time that this happens, I will try to grep out all the X-UID headers from the mailbox.

Cheers David

David Schweikert | phone: +41 44 632 7019 System manager ISG.EE | walk: ETH Zentrum, ETL F24.1 ETH Zurich, Switzerland | web: http://people.ee.ethz.ch/dws