How do the services know when certain events happen?
I assume that "delivered" means the email server received a positive response from the destination server, or at least no error.
I assume "clicked" means the user clicked on a rewritten link in an email.
But how does the service know if someone has opened an email? Maybe a 1x1 image sprite or something? What if the user has set all email to text-only?
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source https://www.reddit.com/r/Emailmarketing/comments/hmat9h/how_do_mail_services_know_when_an_email_has_been/
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