I use Gmail and find it's very rare to get a spam message through. However I find when I do get a spam message, sometimes the to address is not even my email address:
from Sloane Crawford email@example.com reply-to firstname.lastname@example.org to email@example.com date 18 May 2011 20:52 subject Hello sweety. I wanna something new! : 1305748794 Signed by yahoo.com
How did something without my email address in the to field get into my inbox?
For comedy value this is the message:
Hello, I have long hair and fine body. Me want to meet you ... I love Usher and strip, I like to communicate via web camera ... & erotic games ... I wanna show myself and communicate with you via video. Wanna get to know each other better - contact me via e-mail, pls.