Re: mail_utf8_extensions and IMAP Folder Naming

You can use

protocol lmtp {
  mail_utf8_extensions=yes
}

# or protocol lda

to enable it for lmtp (or lda) only.

Aki

> On 16/02/2026 21:05 EET max.wriedt--- via dovecot <[email protected]> wrote:
> 
>  
> i just upgraded my 2.3 installation to 2.4. I like to be bleeding edge and i want to use SMTPUTF8.
> 
> I came across problems with mailboxes that have german umlauts.
> when enabling "mail_utf8_extensions=yes" e.g. Microsoft Outlook gives me mUTF-7 encoded folder names.
> Also the folder names when list via openssl s_client are encoded in mUTF-7.
> Am i missing something or can i disable utf8 for IMAP (UTF8=ACCEPT) only, but keep for LMTP Transport/SMTPUTF8 from postfix to dovecot?
> 
> I am using mdbox format as storage, if that matters.
> 
> My namespace config (shortened):
> namespace inbox {
>   inbox = yes
>   type = private
> 
>   #mailbox_list_utf8 = yes # also tried this -> when folder didn't exist before it would create a new one with utf8, no matter mail_utf8_extensions is on or off
> 
>   mailbox Drafts {
>     auto = no
>     special_use = \Drafts
>   }
>   mailbox Entw&APw-rfe {
>     special_use = \Drafts
>   }
>   mailbox Entw%26APw-rfe {
>     special_use = \Drafts
>   }
>   mailbox Entw\&APw-rfe {
>     special_use = \Drafts
>   }
>   mailbox Entwürfe {
>     auto = create
>     special_use = \Drafts
>   }
>   mailbox Trash {
>     auto = no
>     special_use = \Trash
>     quota_storage_percentage = 110
>   }
>   mailbox "Gel&APY-schte Elemente" {
>     special_use = \Trash
>     quota_storage_percentage = 110
>   }
>   mailbox "Gelöschte Elemente" {
>     auto = subscribe
>     special_use = \Trash
>     quota_storage_percentage = 110
>   }
>   mailbox Sent {
>     auto = no
>     special_use = \Sent
>   }
>   mailbox Archiv {
>     auto = subscribe
>     special_use = \Archive
>   }
> 
>   mailbox Spam {
>     special_use = \Junk
>     auto = no
>   }
> }
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