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=================
Cleansing headers
=================
All messages posted to a list get their headers cleansed. Some headers are
related to additional permissions that can be granted to the message and other
headers can be used to fish for membership.
>>> mlist = create_list('_xtest@example.com')
Headers such as ``Approved``, ``Approve``, (as well as their ``X-`` variants)
and ``Urgent`` are used to grant special permissions to individual messages.
All may contain a password; the first two headers are used by list
administrators to pre-approve a message normal held for approval. The latter
header is used to send a regular message to all members, regardless of whether
they get digests or not. Because all three headers contain passwords, they
must be removed from any posted message. ::
>>> msg = message_from_string("""\
... From: aperson@example.com
... Approved: foobar
... Approve: barfoo
... X-Approved: bazbar
... X-Approve: barbaz
... Urgent: notreally
... Subject: A message of great import
...
... Blah blah blah
... """)
>>> handler = config.handlers['cleanse']
>>> handler.process(mlist, msg, {})
>>> print(msg.as_string())
From: aperson@example.com
Subject: A message of great import
<BLANKLINE>
Blah blah blah
<BLANKLINE>
Other headers can be used by list members to fish the list for membership, so
we don't let them go through. These are a mix of standard headers and custom
headers supported by some mail readers. For example, ``X-PMRC`` is supported
by Pegasus mail. I don't remember what program uses ``X-Confirm-Reading-To``
though (Some Microsoft product perhaps?).
>>> msg = message_from_string("""\
... From: bperson@example.com
... Reply-To: bperson@example.org
... Sender: asystem@example.net
... Return-Receipt-To: another@example.com
... Disposition-Notification-To: athird@example.com
... X-Confirm-Reading-To: afourth@example.com
... X-PMRQC: afifth@example.com
... Subject: a message to you
...
... How are you doing?
... """)
>>> handler.process(mlist, msg, {})
>>> print(msg.as_string())
From: bperson@example.com
Reply-To: bperson@example.org
Sender: asystem@example.net
Subject: a message to you
<BLANKLINE>
How are you doing?
<BLANKLINE>
Anonymous lists
===============
Anonymous mailing lists also try to cleanse certain identifying headers from
the original posting, so that it is at least a bit more difficult to determine
who sent the message. This isn't perfect though, for example, the body of the
messages are never scrubbed (though that might not be a bad idea). The
``From`` and ``Reply-To`` headers in the posted message are taken from list
attributes.
Hotmail apparently sets ``X-Originating-Email``.
>>> mlist.anonymous_list = True
>>> mlist.description = 'A Test Mailing List'
>>> mlist.preferred_language = 'en'
>>> msg = message_from_string("""\
... From: bperson@example.com
... Reply-To: bperson@example.org
... Sender: asystem@example.net
... X-Originating-Email: cperson@example.com
... Subject: a message to you
...
... How are you doing?
... """)
>>> handler.process(mlist, msg, {})
>>> print(msg.as_string())
Subject: a message to you
From: A Test Mailing List <_xtest@example.com>
Reply-To: _xtest@example.com
<BLANKLINE>
How are you doing?
<BLANKLINE>
|
