How to protect Emails(from Bounce) if Exchange is down

 

OS of Exchange = win2008R2

 

Exchange Version = 2010

 

Exchange HA = 2nodes in DAG each has one database (Total 2 databases ). CAS/Hub/All roles on each node(No additional Server for CAS/CAS array and HUB Transport)

 

Domain Controler = one (one win2008 R2)

 

 

I need some suggesstion as I am willing to implement Exchange 2010 in my company environment very soon. Let suppose I am not using Catch All account and my Exchange is getting email LIVE. To prevent loss of email/email bounce in case of Exchange down I will implement Exchange HA ( with two nodes in DAG ). My question is what are the other ways which I have to consider when I am going to implement Exchange Live email receiving and not using Catch All account/option.

 

For example: There is an option of microsoft FOPE (Forefront Online Protection for Exchange) which cache the messages and filter it from viruses/spam then deliver these messages to the Exchange Server which is at our location/premesis.

 

There may also an option of Symantec like FOPE. The name is Symantec Email AntiSpam.cloud. See the below link for more reference. I just want to confirm that the Symantec Email AntiSpam.cloud works same as FOPE works ?

 

http://www.symanteccloud.com/en/us/products/email/anti_spam.aspx