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> excluding people who […] had reported emails as spam

How do you find out whether a user reports you as spam? Wouldn’t that require some sort of feedback from Google, Microsoft, etc?



You can get that feedback from most larger email providers. A lot of email tools can report on it automatically and make sure not to email again.


In our case, Sendgrid will send a certain webhook when you attempt to send to one of these email addresses.




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