You can set up an SMTP server for your domain by choosing an SMTP hosting option (self-hosted or third-party), configuring DNS records like MX, SPF, DKIM, and DMARC, creating email accounts, setting the correct SMTP ports and authentication, and testing email delivery. Once configured properly, your domain can send reliable, authenticated emails without landing in spam. https://blog.oudel.com/how-to-set-up-an-smtp-server-for-my-domain-best-guide/