Set text tone for a certain domain?

[dbmorris]

I need to set a tone when i receive a text from anyone at a certain domain. I get text from this domain but the name on it varies infinetly (i.e. [email protected], [email protected] etc etc). Does anyone know of a way to have a username setup using only the domain (like *.*@certaindomain.com) in contacts that I could set a text tone to?

Thanks for the help,
Danny