New Internet Connection

I setup a new Internet Connection and got Cisco ASA firewall setup for
basic operation. Basically just letting all traffic out and nothing back
in. I then set the default route on the Core switch in HQ to use the new
internet connection.

Internet worked great, but the problem is that with the default route set
to other than our old AIS internet a lot of our services such as email
broke.

All the exchange servers and spam filter sit in our HQ. I thought that as
long as incoming connections could route in through AIS as they always have
things should continue to work fine but it seems this is not the case.

In the long run I plan on setting up all our new public IP addresses on an
external DNS server and adding NAT and firewall rules to the new firewall
so connections to HQ servers can happen straight through the HQ
firewall/New Internet Connection

Is there anything I can do in the short term to allow users in HQ to take
advantage of the new internet connection without breaking the connections
for email and other resources?

Can the old AIS internet provider create a DNS entry and Mail record for
the traffic coming through our new Internet Provider. I don't have much
experience with DNS and Mail record and need some advise before calling our
Internet Provider to make appropriate changes

Thanks

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Received on Mon Dec 12 2011 - 11:41:13 ART