AW: T-Online and problems with this list

Dear Mr. Jorgensen, why don?t you just add this domain to yours hosts file and set up a filter for all msg?s recieved from t-online.de to be mapped to a local account. This won?t do any more harm than blocking all msg?s from t-online.de. Then you do at least have a sample of the offending message ? --- Mit freundlichen Gru?en Kind regards Dirk Schultze Dima Consulting GmbH

-----Ursprungliche Nachricht----- Von: Mads Martin Jorgensen [mailto:mmj@suse.com] Gesendet: Mittwoch, 13. Juni 2001 00:50 An: suse-linux@suse.com Betreff: Re: T-Online and problems with this list

...

Definitely. Question is, if you should forward a "sample" (header) of one of the spam-mails...

We cannot, because the problem never gets that far. Our mailserver rejects it like following: [1]

Jun 12 08:15:39 ns1 postfix/smtpd[8096]: reject: RCPT from mailout01.sul.t-online.com[194.25.134.80]: 450 : Sender address rejected: Domain not found; from= to=

So it never gets that far, it only causes a lot of work for our mailserver, which is exactly the point of a DoS-attack. Lets say he had 100 machines trying this. Then our mailserver would never do anything but reject these connections - hence Denial of Service.

Unless we of course started blocking these IPs ...

[1] And no -- it is not a possibility to let them through. -- Mads Martin Joergensen, http://mmj.dk "Why make things difficult, when it is possible to make them cryptic and totally illogic, with just a little bit more effort." -- A. P. J.

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