[Debconf-team] debconf-announce duplicate emails

[Daniel Pocock <daniel@pocock.pro>]

I'm receiving two copies of each email sent to debconf-announce

Looking at the headers of each, they are both from the debconf-announce
subscription (not some other list) and both sent to the same recipient
address daniel@pocock.pro

Is there some way that some email addresses could have been added to the
list more than once?  E.g. has somebody done a bulk subscription of
addresses that appear in DebConf registration forms without
de-duplicating those who were already subscribed?


Here are header examples from the two copies of today's email:


Received-SPF: None (no SPF record) identity=mailfrom;
client-ip=2001:41b8:202:deb:6564:a62:52c3:4b72; helo=mailly.debian.org;
envelope-from=debconf-announce-bounces@lists.debconf.org;
receiver=daniel@pocock.pro
Received: from mailly.debian.org (mailly.debian.org
[IPv6:2001:41b8:202:deb:6564:a62:52c3:4b72])
	by mail1.trendhosting.net (Postfix) with ESMTPS id CFB94150A5
	for <daniel@pocock.pro>; Thu,  7 Jul 2016 11:11:10 +0100 (BST)



Received-SPF: None (no SPF record) identity=mailfrom;
client-ip=2001:1620:fd1:124::42; helo=smithers.debconf.org;
envelope-from=debconf-announce-bounces@lists.debconf.org;
receiver=daniel@pocock.pro
Received: from smithers.debconf.org (smithers.debconf.org
[IPv6:2001:1620:fd1:124::42])
	by mail1.trendhosting.net (Postfix) with ESMTPS id 09CF3150A5
	for <daniel@pocock.pro>; Thu,  7 Jul 2016 11:11:04 +0100 (BST)