Hello,   I was curious about the process behind some of the metrics for sent emails. Does an "open" refer only to a human opening the message, or do automated tools such as spam checkers that pre-screen messages count towards "open" stats? On a related note, does a previewed message count towards the open rate? I know not every email service has the same preview functionality so would it differ by platform between, say, Outlook and Gmail?   Thank you so much for your time and help! ... View more