Yes it's legal but no you shouldn't do it because it can brake non
compliant applications.

Cheers Don

On Tue, 2006-05-16 at 20:40 +1200, Robert Fisher wrote:
> A while back there was a discussion about acceptable characters in an email 
> address but I cannot remember the definitive answer.
> 
> I have a friend with and address beginning with
> rus&[EMAIL PROTECTED]
> which used to work but now my ISP (Orcon) is bouncing it back with..
> 
>    ----- The following addresses had permanent fatal errors -----
> <rus>
>     (reason: User unknown)
> 
>    ----- Transcript of session follows -----
> 550 5.1.1 <rus>... User unknown
> 
> and....
> 
> Final-Recipient: RFC822; [EMAIL PROTECTED]
> Action: failed
> Status: 5.1.1
> Diagnostic-Code: X-Unix; 67
> Last-Attempt-Date: Tue, 16 May 2006 20:30:24 +1200
> 
> Should I suggest that my friends change their address?
> 

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