Hmm, this is what I have:

# 2.3.19.1 (9b53102964): /etc/dovecot/dovecot.conf

# Pigeonhole version 0.5.19 (4eae2f79)

# OS: Linux 6.1.0-10-amd64 x86_64 Debian 12.1 nfs

namespace inbox {

  inbox = yes

  location =

  mailbox Drafts {

    special_use = \Drafts

  }

  mailbox Junk {

    special_use = \Junk

  }

  mailbox Sent {

    special_use = \Sent

  }

  mailbox "Sent Messages" {

    special_use = \Sent

  }

  mailbox Trash {

    special_use = \Trash

  }

  prefix =

  separator = .

}

plugin {

  listescape_char = /

}

mail_plugins = " listescape"

I see the plugin being loaded when the imap session starts

dovecot-debug.log:Aug 03 21:46:06 imap(user)<29177></vViDw8ChfLAqAI/>: Debug: Module loaded: /usr/lib/dovecot/modules/lib20_listescape_plugin.so

still no go

a select "TEST/BLAH"

a NO [CANNOT] Invalid mailbox name: Name must not have '/' characters (0.001 + 0.000 secs).

From: Aki Tuomi via dovecot <dovecot@dovecot.org>
Sent: Friday, August 4, 2023 1:47 AM
To: Scott <qmail@top-consulting.net>; dovecot@dovecot.org
Subject: Re: Using / in folder names

On 04/08/2023 04:54 EEST Scott <qmail@top-consulting.net> wrote:

Is this possible at all ?

I am trying to import a PST file and it has a slash in the folder name.

Dovecot errors out with :

APPEND "Caixa de Entrada_VIDA/S1" (\Seen)

NO [CANNOT] Invalid mailbox name: Name must not have '/' characters

My namespace separator is the dot and I configured the listescape plugin to

escape / but it still doesn't work.

The listescape documentation says:

The / character is disallowed on POSIX systems.

This plugin allows you to use all of these characters, as long as the

virtual separator (i.e. what is set by the separator setting and used as

such by the IMAP protocol) is changed to something else, which means that

the plugin does not make it possible to use the virtual separator in folder

names.

So it seems that as long as I use the dot, it should work ? Except it

doesn't...

How can I do this import ?

Thank you!

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Should work by just loading listescape plugin and not using / as namespace separator. 

Aki