Salut,
In case Az. 7 O 80/07, the District Court of Lüneburg has ruled that the use of blacklists for mail filtering is an illegal process. The court thereby confirmed the view of a known spammer that the fact that mails from his servers were deleted by the SPAM filter was an act of censorship.
According to the ruling, the fact that a mail server is used to transmit soleily SPAM is not sufficient to block mails from it entirely. Blocking a single mail address would have been sufficient, according to the court. However, even this step would only have been acceptable in order to prevent an immanent danger of a virus attack.
Well, pretty bad...
Tonnerre