$ dig -t txt googleprd._domainkey.yale.edu
; <<>> DiG 9.9.1-P3-RedHat-9.9.1-9.P3.fc17 <<>> -t txt googleprd._domainkey.yale.edu
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 12280
;; flags: qr aa rd ra; QUERY: 1, ANSWER: 1, AUTHORITY: 4, ADDITIONAL: 5