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Add a new field to the user table called verified and make it a SMALLINT. Or use rand to create a random number and add a string and add it to a field called authcode.
Use the mail function to send an email:
mail($email,$_GET['name']; - Account",$_GET['name']...
Although I have no experience with it, I think mod_bandwidth may be an option.
"Mod_bandwidth" (mod bandwidth) is a module for the Apache webserver that enable the setting of server-wide or per connection bandwidth limits, based on the directory, size of files and remote IP/domain.