Netscaler to Load balance Virtual Email Appliance

Question

Hi Everyone, 
 We are about to configure NetScaler to Load balance (internally) the traffic between two clustered appliances and I wonder if anyone else did it using NetScaler or another LB solution and what recommendations would you have in regards to configuration, persistency settings etc... 
 We are doing this to have a site and component resilient SMTP proxy in the event of a site or appliance failure. 
 
 thanks in advance. 
 David P

David Pereira · Answer

Thanks for the replies, 
 We've ended up doing it the following way, 
 A VIP in each site with a single SEA behind for now. (scalable) 
 GSLB owns the DNS record for SMTP and resolves to the primary site VIP and to the secondary in the event of a failure. (resilient) 
 GSLB uses a MEP to monitor the health of the SEA and failover automatically. 
 So from an internal perspective if a SEA fails NetScaler resolves the DNS record for SMTP to the Secondary site. 
 Incoming mail will use the MX records to send to either SEA and the SEA will then route it to Exchange. 
 
 This will allow internal applications that send email to external customers to have a resilient SMTP service in the event of a Site or SEA failure without human intervention. 
 Hope this helps someone else in the same position.