If it fit in length, I would suggest that message;
 

> Questions involving web hosting control panels are off-topic because
> they [customize their systems such that normal administration tools
> and methods no longer apply](//meta.serverfault.com/q/8055), and thus
> require support from the vendor. They may be asked on
> [Webmasters](//s.tk/webmasters) or see [Where can I ask questions
> about web hosting control panels?](//meta.serverfault.com/q/8094)

Source:

`Questions involving web hosting control panels are off-topic because they [customize their systems such that normal administration tools and methods no longer apply](//meta.serverfault.com/q/8055), and thus require support from the vendor. They may be asked on [Webmasters](//s.tk/webmasters) or see [Where can I ask questions about web hosting control panels?](//meta.serverfault.com/q/8094)`

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