Over a year ago I registered for WebProWorld.com to reply to a forum topic. After that I started getting lots of unsolicited email from the site and related sites, no matter how many times I unsubscribed.
Later that month, after figuring out how to access their broken password recovery system, I was able to stop most of it, but a year on I'm still receiving the odd email that I can't seem to stop, short of disabling the alias I used which thankfully was unique to the site. I would think twice about joining that site if I were you.
Those little bsards at WPN are spamming me and they slip past every spam filter in existance, the little buggers! (Even the manual blocking). They use a randomized address jumping between 3+ domain names and you just can’t bloody stop them!