Spamming over this list

Dear Members,

I am rather surprised and very annoyed about something I just found out 
by accident.
I was getting constant e-mails for conference announcements andwanted to 
get rid of them and tried to contact the website owners or customer 
service. My e-mails always got back to me with the error message that 
the site does not operate a mail service though they provide e-mail 
addresses on their site.
Anyway, Ijust found out today by complaining to theLondon Metropolitan 
University where the chairman of the website is located that they are a 
member in the W3C WAI list and if I do not want to receive any more 
e-mails of this kind I should unsubscribe from this mailinglist.

I am wondering now what kind of deals the W3C is operating here? I have 
not been aware of the fact that by subscribing to this list I would also 
subscribe to a whole bunch of other mailinglists in which I do not hold 
interest?

I would appreciate if theadministrators of this list could ellaborate on 
this matter.

Thanks in advance for your assistance!

Yours sincerely

     Ginger Claassen


Ps.: I copy the answer I got here:

On 16 March 2013 07:39, SDIWC Organization
<sdiwc@sdiwc.net>
  wrote:
Zitatblock
Dear Prof. Ezendu Ariwa,
The complainant Prof. Ginger Claassen with his email address
ginger.claassen@gmx.de
  is not found in any of our email lists. Instead, we
found his email subscribed in
w3c-wai-ig@w3.org
  wherein one of our account
is also subscribed in that mailing list. Therefore, each time we send CFP
in w3c mailing list he will receive the email too. We recommend him to
unsubscribe from that mailing list. If he did not want to then we will do
it in our side.
Sincerely yours,
Jackie Blanco


Pps.: Here is what happens if one tries to send an e-mail to these guys:
Mail delivery failed: returning message to sender
This message was created automatically by mail delivery software.

A message that you sent could not be delivered to one or more of
its recipients. This is a permanent error. The following address
failed:

"sdiwc@sdiwc.net":
domain has no mail exchangers