Why don’t deleted emails disappear completely?

Hi! I deleted some emails a while ago, but they still show up when I search my inbox. Why don’t deleted emails disappear completely?

I came across a great article on noagendatube.com https://noagendatube.com/ that explains this perfectly. Many email providers don’t immediately erase deleted emails — they often move them to hidden folders or keep backups for a while. That’s why your deleted messages can still pop up. The article offers a clear explanation of how email deletion actually works behind the scenes.