Spam

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My site has recently been getting a lot of spam. Just deleted some 500+ spam comments. Real boring work, to moderate a site.

Several of the spam originates from a UK based ISP.

UK UNITED KINGDOM - - DRAGONARA ALLIANCE LTD

I have marked this as spam in wordpress but the IP addresses keep changing… Does anyone know what else I could do to keep away these spammers? I don’t like capchas and don’t want normal readers to have to do that.