OK, I have a problem I can't find the answer too. I have scoured the forums for a couple hours today and a couple hours yesterday.
This is a new install of WPMU 2.7 on a clean dedicated server.
The install went fine but whenever I try to sign up as a member I get a "Please Check Your Email Address" error from the email validation.
The email addresses are fine they are from other servers I have.
I read this post
http://mu.wordpress.org/forums/topic.php?id=10835
And I have checked the MX and A settings from the domains I have used email addresses to try to sign up and they all returned fine.
I have no plugins
The only modification of admin from the default install was to enable blogs and user accounts.
I can set up an account through admin but can't get the signup to accept email addresses.
If you want to see the signup is at:
http://blafeo.com/wp-signup.php
Any help I could get with this would be appreciated.