We recently changed ISPs. Previously we have not had our own DNS. I need
to set one up! – have tried..but don’t think its correct as mail server
(GWIA) is reporting 450 Host Down message, and unable to browse to our
website using external URL (IE: www.our domain.com). I can however access
our website

Firewall : Nw6.5 and BM3.8 with multiple secondary ipaddresses bound to
public NIC.

Mail : NW6.5 and GW6.5

Contents of RootServerInfo: (some details changed to protect privacy)

$TTL 86400 ; 1 day
RootServerInfo IN SOA dns_mail.RootServerInfo.
2002110561 ; serial
3600 ; refresh (1 hour)
3600 ; retry (1 hour)
604800 ; expire (1 week)
86400 ; minimum (1 day)
NS primary.RootServerInfo.
NS dns_mail.RootServerInfo.
MX 10 ourdomain.com.
$ORIGIN RootServerInfo.
charlotte A 222.333.141.50
mail MX 10 ourdomain.com.

Any help would be appreciated.