; /etc/bind/db.example.com

$TTL			604800
@				IN      SOA		ns.example.com.    joe.example.com. (
		 		 			1			; Serial
							604800			; Refresh
							86400			; Retry
							2419200			; Expire
							604800 )		; Negative Cache TTL
;
example.com.	IN		MX		10 mail.example.com.
example.com. 	IN 		NS		ns.example.com.
ns	 	IN		A		<local ip>
www	IN		A		<local ip>
mail		IN		A		<local ip>