Sending to the internet redundancy..Is this possible

Can anyone tell me how I can accomplish redundancy in mail transport to the internet
Here is my setup
Site A is production and holds all mailboxes
Site B is our failover site
In both site A and site B we have an ex2010 server that sends to the internet via a sonicwall mail appliance. All mailboxes for the company are on the server in site A. I have the servers in both sites config'd with DAGS and when the DBs dismount in site A
the DAGS work as designed. However if the mail appliance goes down in site A all the emails Q up on site A ex2010. I need to configure somehow my ex2010 in site A to send email through the mail appliance in site B if the appliance goes down in site A.
Any help is greatly appreciated!!

There is nothing automatic unless you set both sonicwalls as smarthosts in a single send connector and then make the Site B sonicwall unavailable until its needed somehow. ( or not, maybe you are ok with messages going through the SiteB sonicwall anytime)
or
You could try the same thing with 2 send connectors with the same source servers, but whether Exchange correctly handles that when one of the sonicwalls is unavail is something you will need to test.
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Message Edited by Bifocals on 08-03-2009 07:15 PM
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Sending to the internet redundancy..Is this possible

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