Converting mailboxes to UTF-8

[Артем Перекресний]

Is any proven routine to migrate mailboxes from mUTF-7 to UTF-8 encoding?

I've try to use doveadm list/mutf7/rename but have been stuck with nested
inboxes. Say I have the next structure:

INBOX
INBOX.жыр
INBOX.жыр.ядъ

encoded for FS respectively as

.INBOX
.INBOX.&BDYESwRA-
.INBOX.&BDYESwRA-.&BE8ENARK-

​When I've try to rename ​INBOX.жыр with

doveadm mailbox rename -u me -s "INBOX.&BDYESwRA-" $(doveadm mailbox mutf7
-7 "INBOX.&BDYESwRA-")

I've get the next:

.INBOX
.INBOX.жыр
.INBOX.жыр.&BE8ENARK-

​Sure when I've try to rename ​.INBOX.жыр.&BE8ENARK- I've get a message
that this is not a valid mUTF7-encoded string.

So that is the question.