From Guillermo Pineda-Villavicencio's Home Page
In view of the explosion of spam, I looked for mechanisms to prevent bots from generating spam. The approach that grabbed my attention was the reCAPTCHA Mailhide. reCAPTCHA Mailhide uses reCAPTCHA, a free CAPTCHA used to help the digitization of manuscripts and old time radio shows. So, why not to decrease spam by contributing to that noble cause?
To access an email address, you need to click on the corresponding address, and then solve a CAPTCHA, that is, type the characters you will see in the picture.
If you want to contact me regarding research or work related issues, please do so by emailing me at firstname.lastname@example.org.
For matters regarding the site, please write to email@example.com.
If instead you just feel like writing to me about anything else, please drop me a line at firstname.lastname@example.org.