How to change it, if it matters
For some programs it might matter, in which order
LIST IMAP command shows emails by default.
For example, it might be the reason behind Issue 726 for K-9 Mail.
Or, at lest, it was for me.
To fix it in dovecot IMAP server while using maildirs, you can do the following:
move all mails to a hidden directory and copy them back one-by-one, issuing
doveadm index command after each mail.
These are the commands:
sudo service dovecot stop # stop dovecot server to prevent influence cd ~/Maildir # cd to a target folder rm -f dovecot* # remove all dovecot indexes mkdir hid # make hidden directory mv cur/* hid/ # move all mails there for file in $(ls -rt hid); do # walk through all mails, starting with oldest one mv hid/$file cur/ # move a file back doveadm index INDEX # rebuild dovecot index done rmdir hid # remove temporary directory sudo service dovecot start # start dovecot server
Note that you can do it for any IMAP folder, just change
INDEX to paths to the same folder in filesystem and on IMAP server.