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How Mailchimp (and others) work out if email was opened, went to junk ect [closed]

Im aware of read receipts in emails, but these mean that the reader has to agree to send back the read receipt. But with Mailchimp (and perhaps others) they have a dashboard to show you which people ...
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316 views

Can I migrate from GNU Mailman to MailChimp?

I have ~20 lists, all of which are mostly announce-only (newsletters--recipients do not reply back to the list) running in GNU Mailman. It's alright. Mailman has certainly prooven itself but we want ...