I have been using a java applet that encrypts my email address but allows
visitors to my website to email me. The applet I am using came from the
Hivelogic website but seems to have been removed. A possible substitute
(which I haven't tried myself) is at: http://leon.mvps.org/Encoder/

If you do a Google search using words like "email encryption" you will
probable find links to a number of different applications.

73,

Roger K6XQ