song-yang.net.		30 IN SOA ns1.hosting.co.kr. admin.song-yang.net. (
				34         ; serial
				21600      ; refresh (6 hours)
				1800       ; retry (30 minutes)
				1209600    ; expire (2 weeks)
				86400      ; minimum (1 day)
				)

song-yang.net.		30 IN TXT "v=spf1 a:mail.song-yang.net ip4:192.168.0.110
include:_spf.google.com ~all"

Mail exchangers:
song-yang.net.		30 IN MX 10 gunza.duckdns.org.

Name servers:
song-yang.net.		30 IN NS ns3.hosting.co.kr.
song-yang.net.		30 IN NS ns1.hosting.co.kr.
song-yang.net.		30 IN NS ns2.hosting.co.kr.
song-yang.net.		30 IN NS ns4.hosting.co.kr.