Hot answers tagged mailchimp
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 ...
I am not a lawyer, and this is not legal advice. However, assuming you are in the US, if you otherwise follow the entirety of the CAN-SPAM act and put a warning on the refer a friend page ("Only refer people you know! Don't spam strangers!") then you should be ok, however, I would make sure to add a captcha or similar.
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 ...
It is going to be impossible for someone who doesn't know your exact business needs to say for certain that MailChimp is the right service for you, but it is one hell of a good service and does everything you have said it needs to do in your question. Maybe some type of phased rollout would be the way forward, move one of your lists over to it and see how ...
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