February 12, 2011 
Definition:
function is_email_address_unsafe( $user_email ) {}
Checks an email address against a list of banned domains.
This function checks against the Banned Email Domains list at wp-admin/network/settings.php. The check is only run on self-registrations; user creation at wp-admin/network/users.php bypasses this check.
Parameters
- string $user_email: The email provided by the user at registration.
Return values
returns:Returns true when the email address is banned.
Source code
function is_email_address_unsafe( $user_email ) {
$banned_names = get_site_option( 'banned_email_domains' );
if ($banned_names && !is_array( $banned_names ))
$banned_names = explode( "\n", $banned_names);
if ( is_array( $banned_names ) && empty( $banned_names ) == false ) {
$email_domain = strtolower( substr( $user_email, 1 + strpos( $user_email, '@' ) ) );
foreach ( (array) $banned_names as $banned_domain ) {
if ( $banned_domain == '' )
continue;
if (
strstr( $email_domain, $banned_domain ) ||
(
strstr( $banned_domain, '/' ) &&
preg_match( $banned_domain, $email_domain )
)
)
return true;
}
}
return false;
}
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