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Also, opt outs can be set automatically:
Unsetting unsubscribes 9/2024
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Unsubscribe on mailings from uploaded file
“If we sent a mailing to a purchased list via spreadsheet upload list, and then import the name after the mailing, does Slate recognize those that have opted out from the spreadsheet mailing and then add the opt out tag to the new record?” 9/2024
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