Hi there,
I hope you are fine. You can message if you are free. I understand your point and I read YOUR description and I will configure mailing application on server and will pass all records that is dpf,dkim,dmarc for good inbox.
I have the right skills to do your work I have experience in mailing server configuration.
You can solve your problem send mail client but mail spam client mail with me if you want.
Por favor revise mi portafolio