Michael Tokarev via Postfix-users:
> so now it's the bounce which is *also* marked as requiring SMTPUTF8.
> I'm not sure this is right or not, - the bounce itself hopefully should
> not include non-7bit headers in this case.
Bounces contain the original message header, which required SMTPUTF8
UTF8 text, therefore the returned message requires SMTPUTF8.
Postfix does not auto-detect UTF8 in SMTP mail. You can configre
that (with smtputf8_autodetect_classes), but I don't know that it
is a good idea.
Wietse
> So basically, this change makes the situation worse in practice: there's
> less chance to have a bounce delivered after the patch, since SMTPUTF8
> flag also propagates to the bounce itself, but some systems don't accept
> such emails.
>
>
> But what's more interesting is: I'm submitting initial message from
> another null-client mailserver (while the log above is from a mailhub) -
> because that's where my GECOS field includes 8bit chars. The settings
> wrt utf8 are identical on both. And obviously, I'm patching the internal
> null-client postfix (where cleanup is involved during initial message
> submission).
>
> With or without this patch, the message content is identical, but the
> envelope is different. But postfix on mailhub is *not* patched. And
> it looks like it doesn't detect that a message requires SMTPUTF8 looking
> at the message *contents* which it receives. It is only when the smtp
> client *tells* the message requires SMTPUTF8, postfix believes it. But
> postfix itself does not detect such situation - when the headers contains
> unencoded 8bit data. So if postfix smtpd is supposed to *detect* (as
> opposed to being told) that the message requires SMTPUTF8, this detection
> does not actually work, it looks like. But I'm not sure if smtpd is
> supposed to detect this.
>
> Thanks,
>
> /mjt
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