Re: Majordomo results

From: Matti Aarnio (matti.aarnio@zmailer.org)
Date: Thu Nov 07 2002 - 07:13:28 EST


On Thu, Nov 07, 2002 at 03:39:38AM -0800, William Lee Irwin III wrote:
> On Thu, Nov 07, 2002 at 12:44:55PM +0200, Matti Aarnio wrote:
> > It just generates looped messages that are bounced to the list owner.
> > Subscriber's message had these headers: (yes, we do log EVERYTHING
> > sent to Majordomo.. We don't log everything sent to the lists, though.
> > There are a number of archives for that.)
>
> Could these DoS attempts get filtered somehow?

  Sorry, its me talking "majordomo" -- when a filter is triggered,
  a "BOUNCE" is sent to the listowner(s) for their analysis and decission.

  So yes, they are filtered already by way of a loop filter we have
  introduced, because every now and then people use MTA/MUA softwares
  that make a mistake at receiving a message and consider visible
  "To:" and "Cc:" headers to carry relevant data for message routing..

  Think a bit of this message; "To:" says "linux-kernel@vger", but
  it will nevertheless be sent to thousands of recipients whose
  addresses are not visible in these headers at all.
  The Internet Email is routed and transported by SMTP-envelope data,
  which in normal cases is not displayed in visible headers.
  Things in these visible headers have at most incidental relationship
  with actual message routing and destinations.

> Thanks,
> Bill

/Matti Aarnio
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