$TTL 3h
@       IN SOA  dns1.abc.co.uk. hostmaster.abc.co.uk. (
        2006011701      ; Serial                                                
        2h      ; Refresh after 2 hours                                         
        1h      ; Retry after 1 hour                                            
        1w      ; Expire after 1 week                                           
        1h )    ; Negative caching TTL of 1 hour                                

; Name servers                                                                  
        IN NS   dns1.abc.co.uk.
        IN NS   dns2.abc.co.uk.

; Mail exchangers                                                               
        IN MX   10      mail.def.org.uk.

; Addresses for canonical names                                                 
www     IN A    66.179.181.113
mail    IN A    66.179.181.113
webmail IN A    82.133.91.134

$ORIGIN lists.def.org.uk.
        IN MX   10      mail.def.org.uk.