The mailing list for listmasters using Sympa

[Matthew Caron <address@concealed>]

Thanks!

I should also mention that it doesn't actually work. The spam
suppression, I mean. Spammers just set up their own mailservers with
their own DNS records and send "legit" email. So, there was a whole
bunch of work which amounted to naught, and the real "solution" is
heuristic matching (SpamAssassin, what used to be Postini but is now
owned by Google, etc.)

On 05/26/2016 10:09 AM, David Verdin wrote:
> I loved the way you explained it!
> 
> Actually, I will probably steal it from you the next time I have to
> speak about it. :-D
> 
> Cheers,
> David
> Le 26/05/2016 à 15:48, Matthew Caron (via sympa-users Mailing List) a
> écrit :
>> Short answer: Because it has to, else things will bounce.
>>
>> Long (and very biased) answer: A long time ago, in times immemorial,
>> anyone could send email through any mailserver as anyone. But, then the
>> spammers came, abusing these open relays, and folks closed them down,
>> requiring authenticated connections and restricting from whom they would
>> relay mail. But, this was not enough, and the spam continued, and some
>> people who were too clever for their own good sought to restrict what
>> mail their servers would accept by only accepting mail from
>> preauthorized (via DNS) servers for that domain[1]. This effectively
>> prevented spoofing of the from: address to come from a different domain
>> than the one for which the server is one of the MXs, because if the mail
>> came from address@concealed and wasn't sent from a mailserver listed in the
>> SPF DNS record by foo.com, then the receiving MX would refuse receipt.
>> And lo, there was the wailing and gnashing of teeth because mailing
>> lists had relied on using that very trick to relay mail from address@concealed
>> to all of the subs, and there were bounces from the @gmail.com and
>> @aol.com and the misery was great. And thus, the solution was to have
>> the email always come from the mailing list, and therefore the server
>> sending the mail was an authorized MX for that domain, and all was well.
>>
>> You can, however, tune the presentation, as is done on this list, by
>> going to Edit List Config -> DKIM and scrolling down to the "New From
>> name format" configuration. Thus, you get things like:
>>
>> From: "Simone Dal Maso" (via sympa-users Mailing List)
>> <address@concealed>
>>
>> Which helps us humans keep track of who said what.
>>
>> [1] See also:
>> SPF - https://en.wikipedia.org/wiki/Sender_Policy_Framework
>> DKIM - https://en.wikipedia.org/wiki/DomainKeys_Identified_Mail
>> DMARC - https://en.wikipedia.org/wiki/DMARC
>>
>> Hope this helps and was mildly amusing.
>>
>> On 05/26/2016 06:40 AM, Simone Dal Maso (via sympa-users Mailing List)
>> wrote:
>>> Hello,
>>> I'm really happy because now I had managed postfix+sympa working great!
>>> Following the tutorial suggested by the debian documentation was the
>>> solution. Quite long, but works.
>>> Now... I created my first super mailing list. :-)
>>> I have a problem with the from field, because any email arriving to me
>>> has the listName as sender, and not my name.
>>> I suppose it was the sender_anonymous parameter, but it is empty... from
>>> the web interface. How can I solve this?
>>> Thank you!
>>>
>>>
> 
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> *David Verdin*
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-- 
Central planning is as smart as the aggregate intelligence of the
central planning committee. A market is as smart as the aggregate
intelligence of the participants in that market.
==
PGP Key: http://www.mattcaron.net/pgp_key.txt
 ~~ Matt Caron ~~