Debugging recursive bind

[Marco Michelino]

Hi all,
I have a recursive dns server that sometimes returns errors on queries
even if the requested domain exists:


# dig @myserver agriturismolacapraccia.it mx

; <<>> DiG 9.3.4-P1.1 <<>> @myserver agriturismolacapraccia.it mx
; (1 server found)
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: SERVFAIL, id: 12554
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 0

;; QUESTION SECTION:
;agriturismolacapraccia.it.     IN      MX

;; Query time: 34 msec
;; SERVER: XX.XX.XX.XX#53(XX.XX.XX.XX)
;; WHEN: Fri Nov 21 10:59:14 2008
;; MSG SIZE  rcvd: 43


My log file shows no error... how can I debug the query to understand
what's going wrong?