Question and response
Question
dig spf-external.shop-pro.jp. MX
Answer
spf-external.shop-pro.jp. 300 MX 10 mail20.shop-pro.jp.
Authority
The response has no authority records.
Additional
mail20.shop-pro.jp. 300 A 133.130.34.99
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0