Blocking unwanted guests with NGINX

Lately, my sites are being hammered by “unwanted behavior”. Because I feel I cannot blindly trust my WordPress installs to be 100% bug-free, I like to block as many of these unwanted behaviors before any PHP code is executed on my server. Currently, I use the following NGINX techniques to block unwanted visitors.
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Referrer spam (200912-01)

Recently I’ve been noticing a referrer spammer targeting my sites from the IP address 94.102.63.60. Trying to promote aimtrust and theinvestblog.
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Stopping referrer spam (Part 2)

Let’s add a little more data to my previous article on stopping referrer spam. It’s the current list of blocked IP addresses. Currently the list blocks 245 addresses.
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Stopping referrer spam (or die trying)

Referrer spam, to some webmasters something unknown, to others a severe pain in the butt. People visiting your website while faking a refferer aren’t that bad, but people actually using webspiders to massively desecrate your website statistics are very annoying, these people need to be targeted.
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Adding SPF records in Plesk

As of Plesk 7.1.4, Plesk allows us to add TXT records in the DNS for a domain, thus allowing us to add SPF records. SPF is, in theory, a good way to stop spam. In short, SPF allows you to tell the world, which mailservers are allowed to send emails using your domain in the From address.
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