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Re:Chase did a bad thing, so we did a good thing by m-ee on Thursday June 13, 2019 @12:43AM (#20171855)
Certified mail with a return receipt
Re:Chase did a bad thing, so we did a good thing by mkay581 on Sunday June 16, 2019 @01:59PM (#20196889)
Sending certified mail only can prove that something was sent. Doesn't necessarily mean that the mail you sent contained an opt-out notice.