I believe that IPortalx uses Web Wiz Forums version 7.x
Allot has been added since version 7 to prevent spammers including the use of a new CAPTCHA security code created on the fly instead of using a library of just 200 images that version 7.x used. There where also issues with the IP banning system with version 7.x which have now been fixed. With version 9.x you can go as far as having the email activation sent to the forum admin so that the user can be checked out by the admin before the account is activated by the admin.
Your idea is a good idea, however if you have CAPTCHA enabled on the registration form with email activation enabled then a bot can not signup anyway. So would be a rather redundant system that would probably course support issues with people not fully reading the email and clicking the wrong link and getting their email banned.
What you tend to find now a days is that sites with CAPTCHA enabled that most of the spammers are humans, so the extra protection in the activation email that you suggest would not work. Often those people who spam employ people in sweat shops on $1 a day to spam as many sites are possible rather than using automated bots to do the sapmming.
You would probably actually be better of using IP databases such as GeoIP to ban the IP addresses of developing countries where these human spamming sweat shops are usually located. However, you may also be banning people you want to enter your forums as well.
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