Hi there,
I've read threw your project carefully and I understand your need the PowerMTA Software to install on your CentOS Machine.
I'm very experienced SMTP Server Configuration and Troubleshooting, PowerMTA Configuration, SMTP Authentication(SPF, Dkim, Dmarc), SMTP IP Rotation, SMTP IP/Domain Reputation, Email Marketing, Email Handling.
I have the PowerMTA Software and I can provide you.
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.