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Re: policy debugging

There are many legal results from the "HELO" command, from the RFC

            HELO
               S: 250
               E: 500, 501, 504, 421
         250 Okay (and various others)
         500 Syntax error, command unrecognized
         501 Syntax error in parameters or arguments
         504 Command parameter not implemented
         421 <domain> Service not available,
             closing transmission channel
            [This may be a reply to any command if the service knows it
            must shut down]