> Could anybody confirm exactly which characters, if any, are NOT valid in an
> email address.

=such rules of the Internet are laid out in documents called "RFC"s (initially they 
are "Requests for Comment"
but once adopted become ...) You are looking for RFC822 (although there are others 
pertinent to email). Try

=unfortunately beware, the 'rules' are honored as much in the breach as the 


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