Why is this website telling me I'm a spammer?

OK, this is really annoying. I've tried two internet connections (both wired and wireless). I tried to sign up for a forum website (REX Support Forums)
After filling out complete information and agreed to the terms and stuff, the website tells me I'm a "known spammer". When I tried to create my account again to see what's wrong, I typed my email and beside the input box, the following message says "Banned E-mail". The next thing was I wasn't allowed to view forums anymore. The screenshot below is the greeting I get every time I try to access the forum on their website:
I've known recently that their forums had been Ddos attacked. It also tells me to check if my e-mail is listed here: (Stop Forum Spam) Can anyone tell me why this is occurring and how to solve this? Thanks in advanced. :)

Just for your information: I am and will never be a spammer. :)

It is occurring because twice in the last two days your details have been added to the SFS database, the only way to get then removed is by contacting the stop forum spam folks - http://www.stopforumspam.com/removal .

z3r010 said:

It is occurring because twice in the last two days your details have been added to the SFS database, the only way to get then removed is by contacting the stop forum spam folks - Stop Forum Spam .

I have contacted them and asked for a removal request, and have validated my e-mail address to process my removal request. Awaiting their response. Thanks for your reply z3r010. I appreciate it.