Alright, thanks to all of you for the quick replies. As of this writing, the 
list has been reconfigured to create an explicit perimeter between the 
non-members and members. The public can no longer let themselves in.

Not totally out of the woods yet.

- Someone please confirm if you can invite others using Members page -> "Add 
Member". If not, then please follow up with me.
- This model can be compromised by someone going rogue and inviting a bunch of 
spammers. I'm expecting that our communal trust is high enough to make this 
unlikely.

Considering the risk profile seems less scary, disregard request to delete my 
emails. :)

On 12/18/21 3:02 PM, Matthias Felleisen wrote:

> +2! And many thanks. (I was personally spared this spam until very recently. 
> No clue why)
>
> — Matthias
>
>> On Dec 18, 2021, at 2:55 PM, Robby Findler <[email protected]> wrote:
>>
>> +1! Thank you.
>>
>> Robby
>>
>> On Sat, Dec 18, 2021 at 1:43 PM Matthew Flatt <[email protected]> wrote:
>>
>>> The "members" option sounds right to me. Thanks for tracking down a way
>>> to improve the situation!
>>>
>>> At Sat, 18 Dec 2021 19:35:23 +0000, Sage Gerard wrote:
>>>> Core team,
>>>>
>>>> Sam asked me to issue bans for a troublesome spammer. I've done so, even
>>>> just today. I understand I need quorum for larger decisions. This is why
>>>> I have not yet reconfigured the list to permanently stop the spammer.
>>>> After researching the problem further, I need your urgent attention.
>>>>
>>>> I found that the spam messages sometimes link to other Google group
>>>> posts affected by the spammer. A recent trail leads to a
>>>> comp.lang.python Google message in 2017. I suspect that email addresses
>>>> are scraped in unmoderated lists that freely hand out membership. After
>>>> checking the list settings, I found that this is one of those lists. I
>>>> hypothesize that our email addresses are being scraped and
>>>> cross-referenced for use in other unmoderated lists.
>>>>
>>>> It's one thing to flatly complain about a spammer on this list, and
>>>> another to willingly maintain a transmission vector. We need to stop
>>>> automatically handing out group membership with our current settings. We
>>>> can have ________ issue list memberships. I need you all to fill in the
>>>> blank with "moderators" or "members." I'll translate the settings
>>>> accordingly.
>>>>
>>>> Given the holidays, I respect your time. Please reciprocate with respect
>>>> for the urgency this problem creates. I will revoke my own mailing list
>>>> privileges and membership in three weeks, on January 8th, 2022. I will
>>>> leave the settings however they read at the time to prevent
>>>> interruption, and request that own messages then be deleted to limit the
>>>> role my email address plays for the spammer.
>>>>
>>>> I am not volunteering to moderate membership applications, and I am not
>>>> commenting on how to verify the impact of possible email leaks. Between
>>>> the Discourse move and (majority?) perspective towards email, I'm not
>>>> sure how I would be useful doing either. If my opinion holds weight, I'd
>>>> advise the answer be "members" so that any available moderators can
>>>> focus on rule breakers while the community grows at a self-directed speed.
>>>>
>>>> Let me know, and thank you.
>>>>
>>>>
>>>>
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>>>
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