Historically, there were multiple cases where spams were sent with faked From: email address of existing list members. Any solution will need to not end up blocking innocent members.

Regards,

KTC

On 10/05/2021 17:51, Adithya K wrote:
I have a suggestion to this. I think list admins can be provided with two options: one, to block a person only from the specific list and two, to block the user from all the mailing lists. Not sure whether it can be implemented.

On Mon, May 10, 2021 at 10:10 PM effe iets anders <[email protected] <mailto:[email protected]>> wrote:

    I was indeed thinking of multiple lists confirming the same
    behavior. But that will never fully exclude Asaf's concerns.

    The use case I'm thinking about is not the individual annoying user
    (no rush with that) but rather the spammer that sends the same spam
    to all kinds of mailing lists. For that, some automated process
    would speed up things considerably, and avoid cluttering the system.
    There may be better solutions to address this though.

    Lodewijk

    On Mon, May 10, 2021 at 1:04 AM Dimitar Dimitrov
    <[email protected]
    <mailto:[email protected]>> wrote:

        Yes, some global & human review seems necessary.

        Maybe a higher threshold would make sense. E.g. if a user gets
        blocked on two or three lists, then a global block is triggered.

        На сб, 8.05.2021 г. в 14:20 ч. Asaf Bartov
        <[email protected] <mailto:[email protected]>> написа:

            (This could also be an attack vector, though.

            Imagine a local conflict resulting in list admin A marking
            person B's posts as spam on that local list, effectively
            silencing person B across all Wikimedia lists.

            Without mitigation against that [e.g. a global review queue
            of marked spam before it becomes a global block], I would be
            wary of such a feature.)

               A.

            On Sat, 8 May 2021, 02:05 Kunal Mehta <[email protected]
            <mailto:[email protected]>> wrote:

                On 5/7/21 3:04 PM, effe iets anders wrote:
                 > With the new mailman, I'm really excited to see
                global bans. Is there
                 > already some workflow we're supposed to follow to
                mark spam? It would be
                 > great if listadmins could mark stuff as spam and that
                would then trigger
                 > global bans somehow if it happened multiple times. I
                know I can file a
                 > ticket, but want to make sure we first arrive on a
                desirable solution
                 > before we throw it into the dev's lap(s) :)

                Yeah, that would be really nice. In the past this has
                been proposed as
                "Allow list admins to train spam filters"[1] after GNOME
                patched their
                Mailman to do so.

                Upstream mailman3 has a bug for this as well[2], where
                they suggest that
                a plugin could be written for this. If someone writes
                said plugin and it
                works, we can definitely deploy/enable it.

                In the meantime I would suggest if you notice a new spam
                problem, post
                here, see if other list admins also say they're having
                similar problems,
                and then we sysadmins can take action.

                [1] https://phabricator.wikimedia.org/T244241
                <https://phabricator.wikimedia.org/T244241>
                [2] https://gitlab.com/mailman/mailman/-/issues/88
                <https://gitlab.com/mailman/mailman/-/issues/88>

                -- Kunal



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