How does a domain name gets blacklisted ?

Hello,

I had in the previous months my domain name blacklisted when i uploaded and sent bulk list of emails through mailchimp !

Therefore, i would like to know exactly how does a domain name gets blacklisted :

- Is it because Mailchimp reports you to a certain organization when it notices suspicious activities of spam ?
- Is it the users that receive the content from that report you somehow ?

If possible i wanna know exactly at what point and who's reponsible for the blacklisting matter ?



It's very important for me to know the trigger event for the blacklisting, thank you very much for your help !

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https://www.blackhatworld.com/seo/info-domain-are-blacklisted.196802/
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https://www.blackhatworld.com/seo/domain-name-blacklisted-marked-as-scam.769652/