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Sirtaj Singh Kang writes:

> On 20-Apr-10, at 4:52 PM, Anil Seth wrote:
> [snip]
>> I do not know about this site, but I suspect that more often than not,
>> it comes under 'social  engineering'.

> The frequency and variation of these invites (esp. from well-known
> sites like linkedin) suggests that that's not what this is. Much more
> likely is people who've added people to their addressbooks with the
> mailing list address as contact info.

> I'm actually genuinely interested in understanding how this works. How
> do the invites get through to the mailing list? Are all the sender
> addresses (sko...@skoost.com in this case) subscribed?

The original headers (esp. the 'Sender' header) of the original email are
wiped-off/replaced by mailman, so I'm not sure, but to be able to post to a
member-only GNU Mailman managed list, the address listed in the 'Sender'
header OR 'From' header must be the member of the list.

- -- 
They who can give up essential liberty to obtain a little temporary safety,
deserve neither liberty nor safety.
  -- Benjamin Franklin, Memoirs of the life and writings of Benjamin Franklin
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