Not getting instant emails

Not getting instant emails

Hi 
I am not getting an instant email when a device goes offline but i do get a test email what is the problem i am using the latest free version I am trying to setup a monitoring system for an ISP and they can only buy after i have proven the product works well and what is the best sms module for sms notifications.Is it possible to merge 20 subnets that are on different networks and in different locations over the internet to create one Noc station  
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