Special characters in foldernames about imapsync HOT 1 OPEN

I've read issues about special characters in the password,

In the password or in the folders names?

How can/ should I handle special characters like ä ö etc.

The folder is skipped while running imapsync and is displayed as 03_März (actual name is 03_März).

03_März
is coded
03_M&AMMApA-rz

Any suggestions? :)

Look at the imapsync output where it lists folders,
The left side is the name to use with --f1f2 --folder etc.

./imapsync --testslive --justfolderlist
...
Host1: folders list (first the raw imap format then the [X] = [Y]):
* LIST (\HasChildren) "." init
* LIST (\HasNoChildren) "." init.&ZTZO9nux-
* LIST (\HasNoChildren) "." INBOX
12 OK List completed (0.001 + 0.000 secs).

[INBOX]
[init]
[init.&ZTZO9nux-] = [init.# # # ]

Have in mind IMAP was there before utf8

from imapsync.