Lots of Typoed Signups, Never Detected

Yesterday petition website emailed updates or confirmations to almost four dozen of my spamtraps, every single one of them a likely typo of a real email address that probably did sign up for this email. has been emailing many of these email addresses for months without once noticing that nobody is responding to their email. The ESP is Sendgrid.

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Dollar Rent-A-Car: Hitting a Spamtrap Instead of a Real User?

U.S automobile rental business Dollar Rent-A-Car is suddenly sending bulk email to an email address that a) did not request it and b) has never existed. In this case, the likely cause is that a certain user at a large U.S. ISP *did* request this email or at least rent a car from Dollar without unchecking the “send me offers” check box on their web site, but provided a typoed email address that Dollar did not confirm before placing it on their list. In other words, these offers are going to a spamtrap *instead of* to a customer who almost certainly requested them and is likely to want them. The ESP is Responsys.

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