Really appreciate your help.What I understood so far is that MTA can stay on either DMZ zone servers or Application Servers which stay behind client's firewall.As per the diagram below MTA is sitting in DMZ zoneBut in the previous diagram, MTA was sitting in application Servers, that is the reason there was SMTP connection with Application Servers - Please correct me if I am wrong here.RegardsMahesh

Thanks for the reply Jon.A few things which are unclear to me, i need your help to understand it better.As per my understanding, MTA is responsible to send the SMS out to real world with the help of a third party connector like Netsize.If MTA is installed in DMZ zone servers then then sms will be sent by these serversIf MTA is installed on application servers which stay behind the client's firewall , Application Server is responsible for sending the SMS.Any detailed explanation or any kind of he...

Highly appreciate your response Jon.Actually Frontal Servers are the Tracking Servers which stay in DMZ zone and not the Application Servers.

Really Appreciate your help JonYes Frontal Servers as in Web Servers - Tracking Servers that stay in DMZ ZoneIn the above architecture diagram, there is a strong line From Application Server which says SMTP port 25As per my understanding Application Servers are not responsible to send the communication out, but frontal server sends the communication out, so I don;t understand why SMTP port 25 is connected to application serverStrange part is one arrow is outbound and other is inbound to applicat...

Many Thanks for your help Jon.3. Client says that they have this new architecture as they want the application server to connect with their different branches across the globe, as every geo can have only database servers and can connect to these application servers, so its like same application servers are used for different database servers at different geo, it that really can be done?Yes, use FDA, with HTTP(S) if required.-So these data base servers are the campaign database servers, am I righ...