On Thu, Nov 03, 2016 at 04:15:05PM +0100, Johannes Schindelin wrote:

> When it finally sent out the mail, and I thought everything was alright,
> thinking that I could turn out for the night with a well-deserved drink, I
> got this from vger.kernel.org:
> 
> -- snip --
> SMTP error from remote server for TEXT command, host: vger.kernel.org 
> (209.132.180.67) reason: 550 5.7.1 Content-Policy reject msg: Wrong MIME 
> labeling on 8-bit character texts.
> -- snap --
> 
> Is there *anybody* who could give me a clue what this means?

That's a new one for me. One guess, though...

> For the record, I tried to use `git send-email` to send out the
> announcement for the very first time, and the headers of the mbox file I
> fed to that command read thusly:
> 
> -- snip --
> From 2.10.2.windows.1 Mon Sep 17 00:00:00 2001
> From: Johannes Schindelin <johannes.schinde...@gmx.de>
> Date: Wed, 02 Nov 2016 21:43:54 +0100
> To: git-for-wind...@googlegroups.com, git@vger.kernel.org
> Subject: [ANNOUNCE] Git for Windows 2.10.2
> Content-Type: text/plain; charset=UTF-8
> Fcc: Sent
> -- snap --

This is missing a Content-Transfer-Encoding. I think the default is the
traditional 7-bit ascii encoding, but your body has characters with the
high-bit set (your UTF-8 bullet).

Try adding:

  Content-Transfer-Encoding: 8bit

I haven't seen this before, but I do recall that vger's MTA is very
picky about this and wants to rewrite transfer-encodings, so it seems
plausible.

-Peff

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