Comment 3 for bug 266370

I tested with my Entourage which I didn't use so far.
It gave:
  Sm=?ISO-8859-1?B?9g==?=g=?ISO-8859-1?B?5Q==?=sbord
and ends up by processed by mailman email.Header module:
  Sm =?iso-8859-1?q?=F6?= g =?iso-8859-1?q?=E5?= sbord

It looks like they break a statement of RFC-2047:
    Ordinary ASCII text and 'encoded-word's may appear
together in the
    same header field. However, an 'encoded-word' that
appears in a
    header field defined as '*text' MUST be separated from
any adjacent
    'encoded-word' or 'text' by 'linear-white-space'.