Hello guys, after all me and my friend did some tweaking and now by changing wp-includes/wpmu-functions.php you can bypass the email activation link!
Edit wp-includes/wpmu-functions.php
Go find the definition of this function: wpmu_signup_user_notification()
In the last line when it calls wp_mail() function to send the activation email to the user, comment it and write this:
# Redirecting to key activation page, no need for the user to check his/her email!
# We don't need this line! It'll mail the user ;)
//wp_mail($user_email, $subject, $message, $message_headers);
?>
<h1 style='color: white;'>Please wait to generate your password!</h1>
<br />
<h3 style='color: red;'>Don't forget to change password after first login</h3>
<br />
<script type="text/javascript">
window.location = "http://<?php print $_SERVER['SERVER_NAME'];?>/wp-activate.php?key=<?php print $key; ?>";
</script>
<?php
return true;
This is very easy guys. The user gets redirected to the activation page right after hitting the signup key. It's not such a nice tweak since you need to have Javascript enabled, but we all sort of have it in our browsers, don't we?!