If it fit in length, I would suggest that message;
 
> Questions involving web hosting control panels are off-topic at Server
> Fault because they [customize their systems such that normal
> administration tools and methods no longer apply][1], and thus require
> support from the vendor. It may be asked on 
> [Webmasters][2] or see [Where can I ask questions about web hosting
> control panels?][3]

It get the goal of talking about webmaster and it keep both meta post linked, as they give a lot of good informations.


  [1]: https://meta.serverfault.com/questions/8055/what-should-server-fault-do-with-questions-about-web-hosting-control-panels
  [2]: https://webmasters.stackexchange.com/
  [3]: https://meta.serverfault.com/questions/8094/where-can-i-ask-questions-about-web-hosting-control-panels