mod.com.vn.		30 IN SOA x.hkda.vn. kythuat.hkda.vn. (
				2023070600 ; serial
				3600       ; refresh (1 hour)
				1800       ; retry (30 minutes)
				1209600    ; expire (2 weeks)
				86400      ; minimum (1 day)
				)

mod.com.vn.		30 IN TXT "v=spf1 +a +mx +ip4:45.119.84.172 ~all"

mod.com.vn.		30 IN A	45.119.84.172

Mail exchangers:
mod.com.vn.		30 IN MX 0 mod.com.vn.

Name servers:
mod.com.vn.		30 IN NS y.hkda.vn.
mod.com.vn.		30 IN NS z.hkda.vn.
mod.com.vn.		30 IN NS x.hkda.vn.