Exchange 2010 and 2 ISP connections

My network contains 1 SBS 2011 server that has Exchange 2010, a Cisco ASA 5505 firewall, and a Comcast and AT&T modem (for ISP redundancy).  I have configured the ASA, so that when the 1st ISP goes down the ASA fails over to the 2nd ISP and the users can get to the Internet.

I have my MX record pointing to a Spam filter that then forwards the email onto our Exchange server.  I have set up the 2nd ISP IP address for Exchange in the spam filter.  When we are on the 2nd ISP we can get incoming email, but outbound email stays in the queues in Exchange.

Is there something that I need to do in Exchange 2010 to allow traffic to go out through the 2nd ISP?  Is creating a 2nd MX record a possible solution?  If so, can it also point to my spam filter or does it have to point directly to the Exchange server?

Thanks for any help that can be provided.

Thanks,

Chris
BosaloskiAsked:
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Mohammed KhawajaManager - Infrastructure:  Information TechnologyCommented:
If you have two separate Internet feed, my suggestion to you would be to implement a load-balancer which will take care of sending emails to the Internet.  Take a look at RadWare and all you need is a simple load-balancer.
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BosaloskiAuthor Commented:
I have another client with the same setup, except that their spam filter does inbound and outbound emails.  Therefore, they can successfully send and receive emails no matter which ISP connection is active at the time.  I am trying to do the same with this client, but their spam filter only does inbound email.  I need to be able to have them send email no matter which ISP connection is active at the time.

The 2 ISP connections are not active at the same time; therefore, the 2 ISP connections are not used for load balancing, but for redundancy.  This way my client does nto lose Internet connectivity.
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Simon Butler (Sembee)ConsultantCommented:
As you have an external spam filter, just setup Exchange to route email out through that instead. Run the Smart Host wizard in the SBS management console and enter the address of your smart host.

Nice and simple, no need for a load balancer.

Simon.
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BosaloskiAuthor Commented:
I am trying to do the same with this client, but their spam filter can only do inbound email.  I need to be able to have them send email no matter which ISP connection is active at the time.
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Simon Butler (Sembee)ConsultantCommented:
The only reliable method is to use an external smart host service. There are lots of those around, find one and subscribe.
The other option is two Exchange servers, one for each connection.

Simon.
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BosaloskiAuthor Commented:
The resolution was that the backup ISP (AT&T Uverse) was blocking port 25 on the outgoing interface.  Once this was removed email could be sent using the backup ISP.  Thank you everyone for their input on this question.

Chris
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BosaloskiAuthor Commented:
This was the solution.  Once I called AT&T Uverse and they removed the block on outgoing port 25 the email would be sent to the recipients.
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