BOOL tls_remember_esmtp = FALSE;
uschar *tls_require_ciphers = NULL;
uschar *tls_try_verify_hosts = NULL;
-uschar *tls_verify_certificates= NULL;
+uschar *tls_verify_certificates= US"system";
uschar *tls_verify_hosts = NULL;
#endif
uschar *acl_smtp_connect = NULL;
uschar *acl_smtp_data = NULL;
#ifndef DISABLE_PRDR
-uschar *acl_smtp_data_prdr = NULL;
+uschar *acl_smtp_data_prdr = US"accept";
#endif
#ifndef DISABLE_DKIM
uschar *acl_smtp_dkim = NULL;