How do spammers know an email is active?

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I recently put my old Hotmail account on my phone, which I traditionally only checked a few times a year. I went from 1-2 spam emails every few months to several a day, after going through all the old ones and marking them as spam. How is this possible? I haven’t given this email out in years, and none of my monitoring services have flagged this email recently. It seems spammers somehow know this email is active again.

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Anonymous 0 Comments

Alongside all the correct technical reasons in other comments, I just wanted to say that as a daily Hotmail user for years, I have also recently seen a massive influx of spam. It’s entirely possible that Microsoft have weakened their filtering, or someone has found and shared a workaround.

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