The fourth of his techniques is also included even though it did get a very small amount of spam - the technique was still very effective and more importantly does not rely on users to have CSS or JavaScript enabled. Two of those three techniques are included in this plugin. Three techniques stood out as having received zero spam emails during that time. Its conclusions may not apply as strongly today.) (Note: this experiment came out a few years after this plugin was originally created, but at this point was conducted over 10 years ago. During that time he measured the amount of spam received to each of the email addresses. He ensured the page containing those email addresses got indexed by Google and then waited 1.5 years. I urge you to read about an experiment performed by Silvan Mühlemann in which he protected email addresses using nine different techniques. The email obfuscation techniques included in this plugin were chosen for their effectiveness and general applicability with minimal impact on users. Please read the Details section of this documentation to learn more about the techniques employed. See Filters section for c2c_obfuscate_email_filters for complete list of filters that are processed.
But this plugin is here for you if you want to employ the most reasonable means of making email harvesting difficult for your site. Or you can just accept that email addresses will get scraped and spammed, and rely on an email service that is good at filtering out spam. Ultimately, your best bet would be to not publicly expose an email address and to offer a contact form as an alternative means of contact. The plugin’s settings page allows you select which techniques to use. You can decide on a technique by technique basis which ones you’d like to employ as some have potential drawbacks. While techniques abound for email obfuscation, the three techniques included provide the best balance of email address protection with minimal impact on visitors. The plugin allows for use of one or more (or all!) of three techniques for email protection that have proven themselves in the past. “Obfuscation” simply means that techniques are employed to modify email address strings that appear on your site in such a way that bots scraping your site are unable to identify those addresses however, at the same time those emails addresses should still look and work correctly for visitors, as much as possible. Obfuscate email addresses to deter email-harvesting spammers, with a focus on retaining the appearance and functionality of email hyperlinks.
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