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         'The destination system exists and normally accepts mail, but
          something about the system has caused the generation of this
          DSN.'

     ],

    ['X.3.1', 'Mail system full',

         'Mail system storage has been exceeded.  The general
          semantics imply that the individual recipient may not be
          able to delete material to make room for additional
          messages.  This is useful only as a persistent transient
          error.'

     ],

    ['X.3.2', 'System not accepting network messages',

         'The host on which the mailbox is resident is not accepting
          messages.  Examples of such conditions include an immanent
          shutdown, excessive load, or system maintenance.  This is
          useful for both permanent and permanent transient errors.'

     ],

    ['X.3.3', 'System not capable of selected features',

         'Selected features specified for the message are not
          supported by the destination system.  This can occur in
          gateways when features from one domain cannot be mapped onto
          the supported feature in another.'

     ],

    ['X.3.4', 'Message too big for system',

         'The message is larger than per-message size limit.  This
          limit may either be for physical or administrative reasons.
          This is useful only as a permanent error.'

     ],

    ['X.3.5', 'System incorrectly configured',

         'The system is not configured in a manner which will permit
          it to accept this message.'

     ],

    ['X.4.0', 'Other or undefined network or routing status',

         'Something went wrong with the networking, but it is not
          clear what the problem is, or the problem cannot be well
          expressed with any of the other provided detail codes.'

     ],

    ['X.4.1', 'No answer from host',

         'The outbound connection attempt was not answered, either
          because the remote system was busy, or otherwise unable to
          take a call.  This is useful only as a persistent transient
          error.'

     ],

    ['X.4.2', 'Bad connection',

         'The outbound connection was established, but was otherwise
          unable to complete the message transaction, either because
          of time-out, or inadequate connection quality. This is
          useful only as a persistent transient error.'

     ],

    ['X.4.3', 'Directory server failure',

         'The network system was unable to forward the message,
          because a directory server was unavailable.  This is useful
          only as a persistent transient error.

          The inability to connect to an Internet DNS server is one
          example of the directory server failure error.'

     ],

    ['X.4.4', 'Unable to route',

         'The mail system was unable to determine the next hop for the
          message because the necessary routing information was
          unavailable from the directory server. This is useful for
          both permanent and persistent transient errors.

          A DNS lookup returning only an SOA (Start of Administration)
          record for a domain name is one example of the unable to
          route error.'

     ],

    ['X.4.5', 'Mail system congestion',

         'The mail system was unable to deliver the message because
          the mail system was congested. This is useful only as a
          persistent transient error.'

     ],

    ['X.4.6', 'Routing loop detected',

         'A routing loop caused the message to be forwarded too many
          times, either because of incorrect routing tables or a user
          forwarding loop. This is useful only as a persistent
          transient error.'

     ],

    ['X.4.7', 'Delivery time expired',

         'The message was considered too old by the rejecting system,
          either because it remained on that host too long or because
          the time-to-live value specified by the sender of the