Yes, there is a difference. The trademarked meat product is all uppercase, while the UCE is all lower case.
For more about this, read SPAM® Brand and the Internet.
Now that I got that out of the way….
I just received my first spammer registration here today and it got me thinking about all of the tools I have used on my forum sites before and why wasn’t there something like those that I could use here. With a little bit of searching I did find one that does just that. It does check against numerous spammer databases and also reports spammers.
I am not going to post what exact tools I use here, but just say that they are all available via the WordPress Plug-In repository.
So, if you are a apammer, please move along.
If you are Hormel, feel free to send me some SPAM swag. =)