It appears to be a fairly standard practice to show corresponding information without any authentication.
For example on
http://www.nature.com/nature/journal/va ... 09851.html, one simply clicks on the author to send them an e-mail; the security is handled by a captcha.
Although I can't comment on the success of spam bots, judging by the number of users from afghanistan registered on our site (we have captcha off) I'm not quite sure if demanding registration before users can correspond will protect our authors.
I was hoping somebody would be able to muse on the problem; because enabling correspondence without authentication
must be implemented on our site and I was wondering if anybody has written any code in addition to smarty's {mail}.