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): header      NAUGHTY_FROM_TLD  From   =~ /@[a-z0-9\-\.]+\.(tk)/i describe    NAUGHTY_FROM_TLD  From address is from a naughty TLD (eg .tk) score       NAUGHTY_FROM_TLD  2.8 UPDATE: Looks like the spammers get a free …

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