Script to run from cron to send daily messages to IETF Announce showing the email header field change.

This should be run from Jan 6 to Jan 20, after which point we need to deploy analagous changes to the code that constructs last call announcements.

This is related to bug ietf-tools#811

Commit ready for merge.
 - Legacy-Id: 6857

Author: rjsparks

ietf/bin/announce-header-change

@@ -0,0 +1,37 @@
+#!/usr/bin/env python
+
+import datetime
+
+from django.core import management
+from django.template.loader import render_to_string
+
+from ietf import settings
+from ietf.utils.mail import send_mail_preformatted
+from ietf.utils.mail import send_mail
+
+management.setup_environ(settings)
+
+target_date=datetime.date(year=2014,month=1,day=20)
+
+send_mail(request = None, 
+          to       = "IETF-Announce <ietf-announce@ietf.org>",
+          frm      = "The IESG <iesg-secretary@ietf.org>",
+          subject  = "Upcoming change to announcement email header fields (using old header)",
+          template = "utils/header_change_content.txt",
+          context  = dict(oldornew='old', target_date=target_date),
+          extra    = {'Reply-To' : 'ietf@ietf.org',
+                      'Sender'   : '<iesg-secretary@ietf.org>',
+                     }
+         )
+
+send_mail(request = None, 
+          to       = "IETF-Announce:;",
+          frm      = "The IESG <noreply@ietf.org>",
+          subject  = "Upcoming change to announcement email header fields (using new header)",
+          template = "utils/header_change_content.txt",
+          context  = dict(oldornew='new', target_date=target_date),
+          extra    = {'Reply-To' : 'IETF Discussion List <ietf@ietf.org>',
+                      'Sender'   : '<iesg-secretary@ietf.org>',
+                     },
+          bcc      = '<ietf-announce@ietf.org>',
+         )

ietf/templates/utils/header_change_content.txt

@@ -0,0 +1,33 @@
+{% filter wordwrap:73 %}
+We will soon be changing the header fields used in IETF Last Call messages sent to the IETF Announce mailing list.
+
+This message is to to inform you of the change and allow you to test that you are properly receiving messages using the new header fields.
+
+We are making this change to make it more likely that replies go to the intended recipients.
+
+This message will be repeated daily using both the old and new header.
+This instance of the message was sent using the {{oldornew}} header.
+Please ensure you receive both versions.
+These messages will cease, and all Last Call messages to this list will switch to using the new header on or shortly after {{target_date}}.
+
+The specific changes are:
+
+{% endfilter %}
+Old:
+
+   From: The IESG <iesg-secretary@ietf.org>
+   To: IETF-Announce <ietf-announce@ietf.org>
+   Reply-To: ietf@ietf.org
+
+New:
+
+   From: The IESG <noreply@ietf.org>
+   To: IETF-Announce:;
+   Reply-To: IETF Discussion List <ietf@ietf.org>
+
+and the message sent using the New header fields will also be 
+Bcc-ed to <ietf-announce@ietf.org>
+
+Thanks for your patience as we make this adjustment,
+
+The IESG