problem with internationalized headers in email package

["Martin v. Löwis"]

> + An 'encoded-word' MUST NOT appear in any portion of an 'addr-spec'.
> + An 'encoded-word' MUST NOT appear within a 'quoted-string'.
> + An 'encoded-word' MUST NOT be used in a Received header field.
> + An 'encoded-word' MUST NOT be used in parameter of a MIME
>   Content-Type or Content-Disposition field, or in any structured
>   field body except within a 'comment' or 'phrase'.
> 
> 
> However (Python 2.5.2):
> 
>>>> h = Header(u'Andrè <andre at localhost>')
>>>> h.encode()
> '=?utf-8?b?QW5kcsOoIDxhbmRyZUBsb2NhbGhvc3Q+?='
> 
> 
> I'm not sure if this can be considered a bug, but surely this is an 
> invalid header.

Which of the conditions do you consider validated? It seems to me that
this would make a completely correct Subject header, for example.

Regards,
Martin