probably coming from nigeria.... those bastards.
I like Thunderbird, it's a nice one, but I don't like the fact that it doesn't put the SPAM messages into a separate folder, they are all in the same place.
That's the most immature response I have seen on this forum... And I have seen a lot in the past year...
Back on topic, it's probably a virus on someone's computer sending you thos spams. Block the domain name of the email, that should do it.