nn";print NS $fail;print NS $login;}print "$ipaddr disconnectedn";close(NS);}-- [ End of TelnetD ] --Appendix B: Routing Mail========================You can make your mail go through many different servers in order to make the header longer and confuse people who would try to track it down.Example: if you want to send the fake mail to blah@blah.com, and route it through blaha.com, blahb.com and blahc.com, then in the 'rcpt to:' part, simply do this: @blaha.com,@blahb.com,@blahc.com:blah@blah.comNote: this will not work on every Sendmail daemon.Thanks to Magnus Kristiansen for this one! ;-)Appendix C: Faking your IP==========================So you don't want people to find your IP and your hostname when they look at the full header? Then simply fake your IP!You can do this by using Wingates or SOCKS firewalls, or telnetting to the Sendmail daemon from a shell account. If you use either one of those, the full header will show the Wingate's/SOCKS firewall's/shell provider's IP address.If you find a shell account that allows you to telnet out of it, you can use it to fake your IP. Otherwise, use Wingates or SOCKS firewalls. To learn more about then, read our Proxy/Wingate/SOCKS tutorial and our anonymity tutorial at blacksun.box.sk.Also, we recommend going to the books section on our website and downloading the excellent item called "IP Spoofing Demystified". The stuff written in there may not be so practical, but it is very important reading (you will learn a lot of important stuff that you could use later).Appendix D: Reply-to====================The Reply-to option does the following: when a person receives an Email with a reply-to address and sends a reply, the reply is sent to the address specified within the Reply-to command (this does not work on really really old Email clients).To use it, simply insert this line:Reply-to: some-user@some-server.netand replace some-user and some-server.net with the appropriate user and server. You have...