The only way to keep human spammers from getting your email address is to choose not to display it. If you're not concerned about human spammers, you might want to consider "mangling" your displayed email address to keep out nasty email-collecting robots. To change your display properties or mangle your displayed address, go to Edit > Personal Info & Settings. (Login and go to:)

http://www.journalfen.net/editinfo.bml

To choose whether or not to display your contact information, scroll down toward the bottom until you see:

Show your contact information on your LiveJournal?

Click the box next to the question to allow people to see your email address, AIM screen name, etc. You can also choose whether to show it to everybody or just friends.

Next you'll see:

Mangle your displayed email address.

If you have the "show contact" option selected and are afraid spam-robots will find your email address on LiveJournal, select this option. Your email address will be modified so your email address won't be found by email-collecting robots.