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I think it totally depends on your subscriber base, but with Hacker Newsletter I've seen about a 95% success rate. I have always used the default MailChimp subj

by duck 15y ago

I think it totally depends on your subscriber base, but with Hacker Newsletter I've seen about a 95% success rate. I have always used the default MailChimp subject which is "Hacker Newsletter List: Please Confirm Subscription".