I need some help and maybe you can offer some advice about my WordPress site..

I get a lot of spam from spambots and spam from people looking to register on my forum/blog for the obvious purpose of spamming on my site. I have a registration page with one of those CAPTCHA input items and I also have a form where they have to agree to conditions in order to proceed. But these things does not stop me from getting email from people "requesting a username".

I think all the things that I have put on my registration page does not matter if a "_POST" message is sent to the php through the URL address. Is this right? What can I do?

if you want to check if the post is coming from the registration page you could use the HTTP_REFERER. But that probably doesn't stop the spam.

You could use 3rd party spam services like akismet to stop a lot of the spam. An other solution is that you or someone else has to approve comments on the site first.

It is working!