Question and response
Question
dig spf.alumni.cuhk.net. TXT
Answer
spf.alumni.cuhk.net. 86400 TXT "v=spf1 ip4:202.45.188.46 ip4:202.45.188.47 ip4:202.45.188.50 -all"
Authority
The response has no authority records.
Additional
. 0 OPT ; payload 1220, xrcode 0, version 0, flags 0