yup i used to do that back in 2022 but i stopped because i did not have a good amount of Chinese emails /databases to target but it is certainly do-able and i got good results from spamming them
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To inbox qq.com domains, all you need is a freshly hacked aged SMTPs not those types resold to multiple spammers. A fresh letter, a really good open or closed redirect and a pro mailer. If you use mailers like AMS or Gammadyne, then you can set it up to syntax and implement AI. This method is great if you want to always inbox.