Hey there,
After reviewing your project description its clear that you want someone to teach you installing SMTP server and also want to know about rDNS.
I'm very experienced with System Administration, Network Administration, SMTP Server Configuration and Troubleshooting, SMTP Authentication(SPF, Dkim, Dmarc, rDNS), SMTP IP/Domain Reputation.
I know all the secrets of a SMTP server. I'll show you full process of installing a perfect SMTP server with IP Rotation, rDNS. After that you could make the best SMTP server.
Thanks in advance for giving the opportunity to working with you.
Have a good day.
Best Regards,
Serazum Munir.