--- /buddypress/bp-core.php	Sat Dec 11 18:56:08 2010
+++ /buddypress/bp-core.php	Sat Dec 11 18:56:55 2010
@@ -1855,8 +1855,10 @@
 	if ( !$user = get_userdatabylogin( $username ) )
 	        return false;
 
-	if ( ( is_multisite() && (int)$user->spam ) || 1 == (int)$user->user_status )
+	if ( ( is_multisite() && (int)$user->spam ) || 1 == (int)$user->user_status ) {
+		bp_core_add_message( __( 'You were marked as spammer. If you wish to plead your case, please contact the site administrator.', 'buddypress' ), 'error' );
 		bp_core_redirect( $bp->root_domain );
+	}
 	else
 		return $auth_obj;
 }