Let's say a device is configured with an SMTP server so that it can relay emails.
Is the device sending emails to the specified SMTP server and then the SMTP server sends it to the intended recipients mali server?
That would mean device sends to smtp server on port 25, smtp server sends to the recipients mail server on port 25. Recipients mail server sends it to the mailboxes on port 25?
This technical paper will help you implement VMware’s VM encryption as well as implement Veeam encryption which together will achieve the nothing ever in the clear goal. If a bad guy steals VMs, backups or traffic they get nothing.