Jesper Dybdal:
> What I do not understand, postfix-wise, is that I have seen no warnings 
> about "using backwards-compatible" default value of smtputf8_enable 
> during the period where I was using compatibility_level=0.? 

With compatibility_level=0, Postfix always accepts mail with a
non-ascii header or address localpart. Whereas compatibility is
easy to check for features that are implemented in one place,
smtputf8 affects a lot of programs. One would have to enable it 
under the covers, but not enforce it.

        Wietse

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