On 03/06/2025 8:47 PM MST Stephan Bosch via dovecot <dovecot@dovecot.org> wrote:

Can you explain what exactly is wrong in that output?

I think it's this: S: * LSUB () "." [Example]

Groking ABNF (from RFC 3501):

mailbox-data = ... "LSUB" SP mailbox-list ...

mailbox-list = "(" [mbx-list-flags] ")" SP (DQUOTE QUOTED-CHAR DQUOTE / nil) SP mailbox

// Looking at "mailbox" part...

mailbox = "INBOX" / astring

astring = 1*ASTRING-CHAR / string

ASTRING-CHAR = ATOM-CHAR / resp-specials

ATOM-CHAR = <any CHAR except atom-specials>

atom-specials = "(" / ")" / "{" / SP / CTL / list-wildcards / quoted-specials / resp-specials list-wildcards = "%" / "*" quoted-specials = DQUOTE / "\" resp-specials = "]"

So... for the mailbox "[Example]", the "]" is the character that is troubling, since it is an "atom-special". *However*, "mailbox" is an astring, which can be composed of ASTRING-CHARs, and that element specifically adds the "]" back into the list of allowable characters.

Put another way, a "mailbox" only requires quoting (an IMAP "string") if it contains one of the following characters: (){<SP><CTL>%*"\

The mailbox [Example] does not contain any of these forbidden characters, so it can be output without quotes.

The Dovecot output you have provided is standards compliant.

michael

Op 6-3-2025 om 14:59 schreef Lafiel via dovecot:

...

Hi.

The Bat! email client does not display folder, it will appear as ' Example'.

The email client technical support said quotation marks.

Log IMAP:

C: { ------ TImapUpdateSubscription sta
C: 9 LSUB "" "*"
S: * LSUB (\Drafts) "." Drafts
S: * LSUB (\Sent) "." Sent
S: * LSUB (\Junk) "." Junk
S: * LSUB (\Trash) "." Trash
S: * LSUB () "." [Example]
S: * LSUB () "." Example
S: 9 OK Lsub completed (0.001 + 0.000 s
C: } ------ TImapUpdateSubscription fin

I'm using the Dovecot version 2.3.21.1.

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