Yes, but if it weren&#x27;t hard-coded, it wouldn&#x27;t count as being a one-liner. ;)<p>Besides, it&#x27;s rare for DNS names to change; the point of DNS is the underlying server addresses can change without changing the name. And a service like SMTP relay should be less likely to change than other types of host.<p>But still, good point. This could easily be a Param if the function would be used in many environments.