Hey there,
After reviewing your project description its clear that you are looking for someone to fix your SMTP server and DNS records.
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'll be very happy to do this project for you.
Thanks in advance for giving the opportunity to working with you.
Have a good day.
Best Regards,
Serazum Munir.