[time-nuts] 2 (Spoofing)

[Robert Watzlavick]

I used to get tons (100-300 a day) of "backscatter" emails - emails that 
were supposedly sent by me but bounced back because the recipient didn't 
really exist.  I use a web hosting company for my website and email so I 
had them enable SPF (Sender Policy Framework) on my domain and all that 
stopped within a few days.   I'm not an expert on it but the way I 
understand it, any email received by a compliant system is supposed to 
check if SPF is enabled and if so, verify the email is from a legitimate 
source.

Here are more details:
http://www.openspf.org/Introduction

-Bob