vger doesn't like UTF-8 from send-email

Thomas Rast wrote:

First, sorry everyone on the Cc list for the triple post. I first blamed it on the fact that I was Cc'ing Gabor, but apparently the problem was in the content.

The files I handed to git-send-email were UTF-8, and I used my usual git alias to --cc Gabor on the first pass which also results in an UTF-8 encoded name.

I got this back from our university mail server:

  git@vger.kernel.org
  vger.kernel.org #550 5.7.1 Content-Policy reject msg: Wrong MIME labeling on 8-bit character texts. BF:<H 0>; S1753608Ab0FLKCQ ##

AFAICT the original message did not declare an encoding:

  Subject: [PATCH v2 0/2] bash completion: Support "divergence from upstream" warnings in __git_ps1
  Date: Sat, 12 Jun 2010 12:02:14 +0200
  Message-ID: <cover.1276336602.git.trast@student.ethz.ch>
  X-Mailer: git-send-email 1.7.1.561.g94582
  In-Reply-To: <20100612000002.GA30196@neumann>
  References: <20100612000002.GA30196@neumann>
  MIME-Version: 1.0
  Content-Type: text/plain
  Return-Path: trast@student.ethz.ch

It's hard to be 100% sure though because in the infinite wisdom of MS Exchange, the bounce came back with everything wrapped in a layer of HTML(!) and declared latin-1.

Is this a new vger policy, or am I hitting a send-email bug?