The sf.net-maintained syncmail (and I guess other
versions aswell) do not properly apply mime word
encoding to non-ascii characters in From:, e.g. for my
name it sends out "From: Björn Höhrmann ..." while it
should use e.g. "From: =?utf-8?Q?
Bj=C3=B6rn=20H=C3=B6hrmann?= ..." since non-ascii
characters are not allowed in the mail header.