Nevermind: I think I was looking at a sign-up landing page that isn't the legacy sign up landing page. I have switched all links to point to the legacy one, since that's what is linked by default from the "View as Webpage" button (and also since it is the only one that properly shows who the emails are from in the fine print at the bottom of the page).
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"Greet new contacts with one or more automated Welcome Emails depending on their interests or your business goals." - Nick
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