Usually, you need to configure the server's options, such as the server deal with, port amount, security protocols, and authentication possibilities. You might also really need to configure DNS settings and firewall procedures to be sure right email delivery. Whilst testing, you also want to remove and stay clear https://www.upwork.com/services/product/development-it-email-deliverability-inbox-reduce-spam-dns-issues-fixed-dkim-spf-dmarc-1378055073774727168?ref=project_share&tier=0