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Hello
pls i need your help

i work for a webmarketing company we sent a lot of emails(millions) per days so to be a great agent and get evolution carrer
i should to find a way a passage to reach inbox in gmail because they had the more diffuclt configuration to reach inbox. more than hotmail or yahoo my colleagues found yahoo and hotmail so its my turn.

i sent just spam if anyone of you has a methode to reach inbox pls tell me ?

what i do i search for reputed domains compatible with my ip's and i try to edit a header or domain to test if i can reach inbox i dont know if its the right solution
i wish if you understand me

There is a technique used by the great ESP ... But it costs a lot of money

watch this https://www.youtube.com/watch?v=K2BAKnNjtvs&t=5s