Question and response
Question
dig spf.active24.com. NS
Answer
spf.active24.com. 5 CNAME spf.smtp.cz.
Authority
smtp.cz. 3522 SOA ns.dns4.cz. hostmaster.active24.cz. 2026022301 10800 1800 1209600 3600
Additional
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0