Verisign changes violates RFC2821

Just to make it clear, RFC2821 is likely being violated:
   - The reserved mailbox name "postmaster" may be used in a RCPT
      command without domain qualification (see section and
      MUST be accepted if so used.

This is *probably* being violated, but I'm not sure as it gets ambiguous

However, returning a 550 is very wrong. The correct reply should be
    554 Transaction failed (Or, in the case of a connection-opening
    response, "No SMTP service here")
    502 Command not implemented