uschar *process_log_path = NULL;
#if defined(SUPPORT_PROXY) || defined(SUPPORT_SOCKS)
-uschar *hosts_proxy = US"";
-uschar *proxy_external_address = US"";
+uschar *hosts_proxy = NULL;
+uschar *proxy_external_address = NULL;
int proxy_external_port = 0;
-uschar *proxy_local_address = US"";
+uschar *proxy_local_address = NULL;
int proxy_local_port = 0;
#endif