WMI/SSH or SMTP - Which and why?

WMI/SSH or SMTP - Which and why?

Hello,
 
I was wondering what most people use?
 
For Linux - Do you use SSH or SMTP monitoring
For Windows - Do you use WMI or SMTP monitoring?
 
What are the disadvantages of using SMTP monitoring? Can you monitor everything that SSH/WMI can do?
 
 

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