Encrypting e-mail addresses
From ENC Phillips Group Wiki
The ISOGG Wiki uses the extension Email Image to encrypt e-mail addresses in articles. To encrypt an e-mail address use the format <email>joebloggs@isogg.net</email>. This produces an encrypted e-mail address which looks like this:
<email>joebloggs@isogg.net</email>
To see further examples of encrypted e-mail addresses see 23andMe project.