Getting a lot of spam from .tk domains – kill it with spamassassin

Seems they are cheap to set up, spammers set up domainkeys / SPF too! Here’s a spamassassin rule (don’t use it if you get valid mail from .tk):

UPDATE: Looks like the spammers get a free .tk domain, rent a temporary DigitalOcean box, set up spam relay on it and blast out mail until …

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