is the code from the email form tut safe?

Yesterday I noticed that using the send-email form in the below tut, it's possible to add any header you want. For example, you can just write "date: 12/12/2004" and this header will be added. Is this really safe?

http://developers.sun.com/prodtech/javatools/jscreator/learning/tutorials/2/ema il.html

Thanks

[328 byte] By [bronze-starDukes] at [2007-11-26 12:12:42]