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Re:Ask HN: How would you solve the spam problem at Gmail? by gt565k on Thursday December 05, 2019 @01:12PM (#21714627)
First and foremost you want to make sure SPF, DKIM, and DMARC are valid from the sender's mail server

https://www.smartertools.com/blog/2019/04/09-understanding-s...

Then, email filtering companies use things like IP Address of the sender, keywords, and NLP, and other tools to determine if the email has spam and assign it some kind of score to it.

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