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For proper configuration of a public facing mailserver for proper sending and receiving of mail, it is necessary to configure your public DNS. records so that other mailservers can find you to send mail to your users, and so that other mailservers will trust you to receive your mail.

The 3 DNS Records you must know for good email delivery are: Reverse DNS (PTR) SPF (Sender Policy Framework) DKIM (DomainKeys Identified Mail)

Use a website that gathers domain information, like WHOIS lookup, to look up public information about your name server. Search your domain name. Enter your domain name in the search field, such as mywebsite.com, and look up the domain information. Look for Name Server information in search results.

An A record (Address Record) points a domain or subdomain to an IP address. For example, you can use it for store.website.com or blog.website.com and point it to where you have your store. This is a common practice for people who use Amazon, eBay, Tumblr, etc.

The 3 DNS Records you must know for good email delivery are: Reverse DNS (PTR) SPF (Sender Policy Framework) DKIM (DomainKeys Identified Mail)

An A record maps a domain to the physical IP address of the computer hosting that domain. Internet traffic uses the A record to find the computer hosting your domain's DNS settings. The value of an A record is always an IP address, and multiple A records can be configured for one domain name.

While emails run on mail servers, DNS is still very much a part of how messages are delivered. Just like when you enter a website into a browser, each email sent generates a query and must resolve to an IP address. DNS records are what tell mail servers where to deliver messages.