¿Regla inversa de coincidencia de correos electrónicos para grupos?

[jonobacon]

Hi Everyone,

When setting up a group there is this option:

I would like the inverse of this behavior, to add anyone who does not come from my clients email domain (e.g. *foo.com) to be added to this group.

Is it possible to do this?

[codinghorror (Jeff Atwood)]

This is not possible to my knowledge.