Selective email based on usergroup ?

[oldlock]

I need to be able to email members of usergroups, for example all members are in the registered users group, however some are additional members of an another group.

I wish to email all the registered users who are not currently members of the other group, is there a way to do so ?

[oldlock]

Bump ?

Maybe a custom sql query would work ? Alas I don't know the syntax to write the query ......