To track the source of unsolicited emails I receive, I use a small trick. Every time I sign up on a website I add a + domain to my gmail address (you still receive the email).
Today I received a spam email from Groupon to [email protected]. (screenshot - https://twitter.com/martindaniel4/status/917454181094453248)
That basically means that Ticketmaster sold my email to Groupon.
They both lost at least one customer.
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How I caught Ticketmaster selling my email to Groupon | Heykuki News