This is very tricky things, there are no guaranteed that all your emails can go to inbox but you can increase the chance by doing
setting up SPF & Domain Key and also make sure the IP is clean not listed on SBL else will be useless
You need to check your content, there are tools out there to...
Make sure you verified all those emails using software like atompark mail verified to avoid much rejection. If you do have much rejection then the rest of your email will be USELESS!
Then talk to hosting company to see if they willing to set up server to send out this many emails and buying...
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