Hello @user5871287 ,
I'd advise going through this article on why emails get put into Gmail's Promotions inbox tab (assuming the recipient has that turned on). Unfortunately this is only something the recipient can resolve - either by turning off the Promotions tab or by moving your emails to their regular inbox to "teach" the algorithm that's where they want it. This is standard across the industry for ESPs.
If you have additional questions regarding your delivery beyond that, I'd advise speaking with the Delivery team directly.
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