dmalcolm isnt on the nosy of:
  http://bugs.python.org/review/13703/show
despite being on the nosy of
  http://bugs.python.org/issue13703

That's not actually true: dmalcolm *is* in the CC list of http://bugs.python.org/review/13703/show (at PyCon, we checked the Reviewer's list, which is a separate list of users in Rietveld that (I think) are the ones who made reviews).

I created issue 14477 to further experiment.

dmalcolm: can you please report whether you received the email from Rietveld, titled "Rietveld test issue (issue14477)" and posted a minute ago?

On Mon, 2012-04-02 at 16:10 +0000, Martin v. Löwis wrote:
> Martin v. Löwis <martin@v.loewis.de> added the comment:
> 
> dmalcolm: can you please report whether you received the email from Rietveld, titled "Rietveld test issue (issue14477)" and posted a minute ago?

No: I did receive two emails from the *bug tracker* [1], both with
subject
  "[issue14477] Rietveld test issue"
(the first signifying the issue was opened, the second with:
  "keywords: +patch
  Added file: http://bugs.python.org/file25098/readme.diff"

However, I don't seem to have received an email from Rietveld: not with
the title you describe above.

[1] both have
From: =?utf-8?q?Martin_v=2E_L=C3=B6wis?= <report@bugs.python.org>
but are Reply-To:Python tracker <report@bugs.python.org>