[Dovecot] Fixed mailbox id?

[Dieter Knopf]

Hello,

I have many Sieve rules and searching for a way to "track"
renamings/moving of mailboxes (folders) on my IMAP server.
Is there a unique ID for every folder available?  I don't think there,
i found no ID inside my folders :(

If not, it think i need to create a ID-file for every folder and after
that i can track the folders and update the rules =)

Thanks