(:integer NO-RECOVERY "NO_RECOVERY" "Non recoverable errors, FORMERR, REFUSED, NOTIMP.")
(:integer NO-DATA "NO_DATA" "Valid name, no data record of requested type.")
(:integer NO-ADDRESS "NO_ADDRESS" "No address, look for MX record.")
(:integer NO-RECOVERY "NO_RECOVERY" "Non recoverable errors, FORMERR, REFUSED, NOTIMP.")
(:integer NO-DATA "NO_DATA" "Valid name, no data record of requested type.")
(:integer NO-ADDRESS "NO_ADDRESS" "No address, look for MX record.")