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Basically, email providers include a small image with a unique identifier to see if the email was opened or not (if email is opened, the image is called from the server, hence the email was opened). If the receiver does not load these external images, or if the email is sent (or opened) in plain text and thus no external resources are being loaded, then ...


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To be honest with you I would like to think that Mail Chimp will have spf records and domain keys etc all sorted out and generally keeping the reputation of their infrastructure clean. Hence I would imagine this will be issues with your content and interactions from your recipients. A couple of things I have noticed straight off. It looks quite image ...


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Some states require it (Colorado), but it doesn't look like it's coming from mailchimp based on a Google search. If you're using a filtering service on your inbound messages like an antivirus/antispam firewall or an antispam gateway then they may be prepending the header when something matches their filters. It could be Bayesian or a rule specifically for ...



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