Forrest recognise links or e-mail address in the text of the site and automatically converts them into real links or mailto.
if the to attribute is of the following form : \xxx.yyy@zzz.www it is recognised as a mailto link and will be converted too.

To avoid this, you can escape the conversion by prefixing the email adress by the '\' character : \\xxx.yyy@zzz.www will not be converted.
(Note that none of the previous examples are rewritten because we used the '\' character in the source !).