_smtp._tls.iis.se. TXT RRSIG NSEC
Question and response
Question
dig _spf.iis.se. NSEC
Answer
_spf.iis.se. 480 NSEC _smtp._tls.iis.se. TXT RRSIG NSEC
Authority
iis.se. 3600 NS nsa.dnsnode.net.
iis.se. 3600 NS nsp.dnsnode.net.
iis.se. 3600 NS nsu.dnsnode.net.
Additional
. 0 OPT ; payload 4096, xrcode 0, version 0, flags 0