Redundant ISP for Email Server

I have one Exchange 2010 Server 2008R2 on a local domain (domain.local) with two ISP.
Isp 1 has the DNS and PTR set already as I would like to setup my second static ip to have the same settings as my first, so that if the first goes down my service remains live (don't know if this can create a conflict)

1. How do I configure the second IP record? would it be mail1.domai

Open in new window to the static IP?
if so can't I use the same to resolve both IP's rather than AND

2. Does the AND make a difference with any configurations I may have to do on my Exchange 2010 servers?

Please advise urgently.
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Scott CSenior EngineerCommented:
1. Just add another send connector with a higher cost and assign the failover server to it. Name it "Backup to Internet" or something. Address space = "*". Include your smart host. Etc.

2. In DNS, update your current TXT record for the SPF validation.

You probably know this, but make sure port 25 isn't being blocked as well.
civirAuthor Commented:
What do I put in the FQDN? would I put the and used the same with my redundant IP for DNS/PTR creation?
Scott CSenior EngineerCommented:
Yes, I believe so.
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civirAuthor Commented:
With my redundant IP and exchange:  if I set my second ip to will this affect my current OWA that is mapped to and if so How can I ensure my OWA is up when I switch to my secondary IP when my linked to my OWA goes down.
Scott CSenior EngineerCommented:
While using OWA, you'd have to use as you would be coming in another way.
Simon Butler (Sembee)ConsultantCommented:
A second Send Connector isn't going to work.
Furthermore, unless you have a dual WAN router, the server isn't going to be able to use the second connection.

What I have done in the past is to have all outbound email route via a smart host - that could be a spam filtering service or another server under my control in a data centre. Then it doesn't matter what route the email goes out.
Inbound email is easy with two MX records. The host name used by the clients can have both IP addresses in the DNS record, but DNS cannot provide failover.
Therefore if you want connections to be guaranteed, look at deploying either your own load balancer in a data centre or cloud load balancing service.


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