2016-07-25 1:08 GMT+03:00 Timo Sirainen tss@iki.fi:

On 23 Jul 2016, at 13:44, Артем Перекресний kondybas@gmail.com wrote:

...

Is any proven routine to migrate mailboxes from mUTF-7 to UTF-8 encoding? ​For what purpose? By default Dovecot assumes that mailboxes are mUTF-7 on filesystem.​

​​Main idea is to convert FS directories names of the inherited dovecot's v 1.x hierarcy from the mUTF-7 to the readable UTF-8 format​. It's too dizzy to work with directories like .INBOX.&BDYESwRA-.&BE8ENARK-. Also logs are look weird.

I don't think there's any especially easy way to do that. You'd need to write a script that properly goes through the hierarchies and does the renaming.

Here is the quick solution:​ we have to list mailbox names in the reverse alnum order to be sure nested subdirs will be renamed prior to the upper level ​ones:

​#!/bin/sh doveadm mailbox list -8 -A | sort -r | while read user utf7 do utf8=$( doveadm mailbox mutf7 -7 "$utf7" ) [ $utf7 != $utf8 ] && doveadm mailbox rename -u $user -s "$utf7" "$utf8" done #### ​

1. Stop dovecot
2. Add the "UTF-8" key to the mail_location = maildir:/path/:UTF-8
3. Start dovecot. Now all old folders will be shown as plain mUFT7-encoded strings (subscriptions stay correct)
4. Run the script above

​In my case managesieve is already configured to use UTF-8 for sieve rules ​so no additional conversion needed. But if mUTF-7 is used for sieve files doveadm mailbox mutf7 can be used for conversion.

​Artem​