umlaut in email somehow adress possible?

I would like to have something like this for a client jö

when I send an email to this adress eg from gmail I got this message back immediately

Technical details of permanent failure: local-part of envelope contains utf8 but remote server did not offer SMTPUTF8

Any Ideas?

Btw I installed a german locale before and set the locale as default for it.

env | grep LANG LANG=de_DE.UTF-8

i tried this

but it says unused parameter: smtputf8_enable=yes

I think it is some kind of work in progress and they throw it out again.

Closed (fixed)


As far as I know, this isn't possible - the SMTP protocol doesn't support non-ASCII characters.

thank you,

I think they dropped it. At least the feature for postfix is gone.