Can't second this. This is what header I get, when DokuWiki (current devel) sent a mail:
Return-Path: <
foo@lupo49.de>
Delivered-To:
bar@lupo49.de
[...]
To:
bar@lupo49.de
From:
foo@lupo49.de
Reply-To:
foo@lupo49.de
Subject: =?UTF-8?B?W200MWxwcjNmMXhdIFNlaXRlIGdlw6RuZGVydDogc3RhcnQ=?=
Date: Fri, 17 May 2013 13:45:18 +0200
X-LibVersion: 3.3.2
MIME-Version: 1.0
Content-Type: text/plain; charset=utf-8; format=flowed
Content-Transfer-Encoding: 8bit
Message-ID: <20130517114519.2872.230865158.swift@localhost>