[Mailman-Users] blocking spam

[Luis]

Hi, Im one of the administrators of the cmi-bh at lists.indymedia.org mailing
list and I have a really simple question.

How can I block all the e-mails coming from a certain domain? How can I
block all the e-mails coming from lycos.co.kr or korea.com, for example?

Thanks,
Luis.
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