$ORIGIN example.com.
$TTL 3600

@	IN	SOA	dns1.example.com. hostmaster.example.com. (
		2010111218	; serial
		6h		; refresh
		1h		; retry
		1w		; expire
		1d )		; minimum

	NS	dns1
	MX	10 mail

dns1	A	192.0.2.1

; error CNAME, node contains other records
email	CNAME	mail
	A	192.0.2.2