On Tue, Jul 01, 2025 at 12:17:13AM +0200, Steffen Nurpmeso via Postfix-users
wrote:
> |Postfix would forward SMTPUTF8 mail to an LMTP server only if the
> |server announces SMTPUTF8 (in LHLO).
>
> Only to make this clear: postfix simply does not deal with any message
> nor header reencoding at all?
None is generally possible, and none is attempted. A non-ASCII
localpart of an SMTPUTF8 email address has no standard alternative
represenation.
> That is, if i would enable SMTPUTF8, and someone sends a true
> message/global aka SMTPUTF8 email, then this will not be relayed any
> further unless "the next hop" (usually the recipient today thus) has
> support for SMTPUTF8 as such -- it will bounce otherwise?
Correct.
> All that postfix will actually do is to IDNA encode the domain name,
> likely for DNS lookups (i only grep()ped superficially) etc?
Only for DNS lookups. Otherwise, IIRC U-label domain names are left
as-is, something else in your processing pipeline (a milter or
content_filter) might replace U-labels with A-labels, but I believe
Postfix does not.
--
Viktor.
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