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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