if (synchronous_delivery) argv[n++] = US"-odi";
if (connection_max_messages >= 0)
argv[n++] = string_sprintf("-oB%d", connection_max_messages);
if (synchronous_delivery) argv[n++] = US"-odi";
if (connection_max_messages >= 0)
argv[n++] = string_sprintf("-oB%d", connection_max_messages);