Hey there,
After reviewing your project description its clear that you want a software that will send your marketing emails to users inbox and not in spam folder.
I'm very experienced with System Administration, Network Administration, SMTP Server Configuration and Troubleshooting, SMTP Authentication(SPF, Dkim, Dmarc), SMTP IP Rotation, SMTP IP/Domain Reputation, Email Marketing, Email Handling.
I'll be happy to help you with this.
Thanks in advance for giving the opportunity to working with you.
Have a good day.
Best Regards,
Sirajum Munir.