Here's a network analysis tool that can be powerful, for you guys that are helping people out. Let me know what you think about it.

http://www.samspade.org/ssw/


not only can you do header analysis but it includes the following:

-analysing email headers and tracking down the sender
-searching usenet for information using DejaNews
-finding the owner of a domain or an IP address using whois
-a case study in tracking down a spammer


Zone Transfer... - ask a DNS server for all it knows about a domain
SMTP Relay Check... - check whether a mail server allows third party relaying
Scan Addresses... - scan a range of IP addresses looking for open ports
Crawl website... - search a website, looking for email addresses, offsite links etc.; download a website
Browse web... - browse the web in a raw http format
Check cancels... - search your newsserver for cancels

and more...
and the tutorials and help files are worth downloading for.

enjoy
zeroth