Moderation

All members and nonmembers have a moderation action. When the action is not defer, the moderation rule flags the message as needing moderation. This might be to automatically accept, discard, reject, or hold the message.

Two separate rules check for member and nonmember moderation. Member moderation happens early in the built-in chain, while nonmember moderation happens later in the chain, after normal moderation checks.

>>> mlist = create_list('test@example.com')

Member moderation

>>> member_rule = config.rules['member-moderation']
>>> print(member_rule.name)
member-moderation

Anne, a mailing list member, sends a message to the mailing list. Her postings are not moderated.

>>> from mailman.testing.helpers import subscribe
>>> subscribe(mlist, 'Anne')
<Member: Anne Person <aperson@example.com> on test@example.com
         as MemberRole.member>

>>> member = mlist.members.get_member('aperson@example.com')
>>> print(member.moderation_action)
Action.defer

Because Anne is not moderated, the member moderation rule does not match.

>>> member_msg = message_from_string("""\
... From: aperson@example.com
... To: test@example.com
... Subject: A posted message
...
... """)
>>> member_rule.check(mlist, member_msg, {})
False

Once the member’s moderation action is set to something other than defer, the rule matches. Also, the message metadata has a few extra pieces of information for the eventual moderation chain.

>>> from mailman.interfaces.action import Action
>>> member.moderation_action = Action.hold
>>> msgdata = {}
>>> member_rule.check(mlist, member_msg, msgdata)
True
>>> dump_msgdata(msgdata)
moderation_action: hold
moderation_sender: aperson@example.com

Nonmembers

Nonmembers are handled in a similar way, although by default, nonmember postings are held for moderator approval.

>>> nonmember_rule = config.rules['nonmember-moderation']
>>> print(nonmember_rule.name)
nonmember-moderation

Bart, who is not a member of the mailing list, sends a message to the list.

>>> from mailman.interfaces.member import MemberRole
>>> subscribe(mlist, 'Bart', MemberRole.nonmember)
<Member: Bart Person <bperson@example.com> on test@example.com
         as MemberRole.nonmember>

>>> nonmember = mlist.nonmembers.get_member('bperson@example.com')
>>> print(nonmember.moderation_action)
Action.hold

When Bart is registered as a nonmember of the list, his moderation action is set to hold by default. Thus the rule matches and the message metadata again carries some useful information.

>>> nonmember_msg = message_from_string("""\
... From: bperson@example.com
... To: test@example.com
... Subject: A posted message
...
... """)
>>> msgdata = {}
>>> nonmember_rule.check(mlist, nonmember_msg, msgdata)
True
>>> dump_msgdata(msgdata)
moderation_action: hold
moderation_sender: bperson@example.com

Of course, the nonmember action can be set to defer the decision, in which case the rule does not match.

>>> nonmember.moderation_action = Action.defer
>>> nonmember_rule.check(mlist, nonmember_msg, {})
False

Unregistered nonmembers

The incoming runner ensures that all sender addresses are registered in the system, but it is the moderation rule that subscribes nonmember addresses to the mailing list if they are not already subscribed.

>>> from mailman.interfaces.usermanager import IUserManager
>>> from zope.component import getUtility
>>> address = getUtility(IUserManager).create_address(
...     'cperson@example.com')
>>> address
<Address: cperson@example.com [not verified] at ...>

>>> msg = message_from_string("""\
... From: cperson@example.com
... To: test@example.com
... Subject: A posted message
...
... """)

cperson is neither a member, nor a nonmember of the mailing list.

>>> def memberkey(member):
...     return member.mailing_list, member.address.email, member.role.value

>>> dump_list(mlist.members.members, key=memberkey)
<Member: Anne Person <aperson@example.com>
         on test@example.com as MemberRole.member>
>>> dump_list(mlist.nonmembers.members, key=memberkey)
<Member: Bart Person <bperson@example.com>
         on test@example.com as MemberRole.nonmember>

However, when the nonmember moderation rule runs, it adds the cperson as a nonmember of the list. The rule also matches.

>>> msgdata = {}
>>> nonmember_rule.check(mlist, msg, msgdata)
True
>>> dump_msgdata(msgdata)
moderation_action: hold
moderation_sender: cperson@example.com
>>> dump_list(mlist.members.members, key=memberkey)
<Member: Anne Person <aperson@example.com>
         on test@example.com as MemberRole.member>
>>> dump_list(mlist.nonmembers.members, key=memberkey)
<Member: Bart Person <bperson@example.com>
         on test@example.com as MemberRole.nonmember>
<Member: cperson@example.com
         on test@example.com as MemberRole.nonmember>

Cross-membership checks

Of course, the member moderation rule does not match for nonmembers...

>>> member_rule.check(mlist, nonmember_msg, {})
False
>>> nonmember_rule.check(mlist, member_msg, {})
False