open your checkpoint installation
on search tab...enter stealth
read the topic, its pretty explicit.
you can also setup a rule to specifically block (drop) ICMP, or just things
like Ping, according to just how paranoid you want to be.
Outgoing mail is certified Virus Free.
Checked by AVG anti-virus system ( http://www.yqcomputer.com/
Version: 6.0.734 / Virus Database: 488 - Release Date: 8/4/2004