Hey there,
After reviewing your project description you are unable to inbox on google mailbox since they have marked your IP as spam. You want to fix this but you also don't want to change your outlook email setting.
I'm very experienced with System Administration, Network Administration, SMTP Server Configuration, SMTP Server Troubleshooting, SMTP Authentication(SPF, DKIM, Dmarc) SMTP IP Rotation. SMTP Server IP Reputation.
I'll be happy to fix your problem.
Thanks in advance for giving the opportunity to to working with you.
Have a good day.
Best Regards,
Sirajum Munir.