An anonymous reader writes: As those of us who have to deal with transactional email know, you have to provide a method to unsubscribe when sending email to comply with the CAN-SPAM act. However, this requirement makes it far too easy for, lets say, a competitor to find your unsubscribe page/address and bomb it with requests to unsubscribe everyone on their own mailing lists. Have you ever had this problem? How do you deal with this?
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