Hello,
I am an experienced Web developer and Server admin, I have studied your job description and can help you to setup SMTP on new Root Server. I am well versed with SMTP, Zimbra mails, Gsuite mails, Email server etc.
My other expertise- Linux, Unix, Ubuntu, DNS, Lets encrypt, SSL, SSH, CentOS, CPanel/WHM, Plesk, Godaddy, VPS, VPN, AWS, Nginx, Digital Ocean, Apache, MySQL, PHP, etc.
Thanks