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The Domain Name Server (DNS) tells a web or mail server where to deliver SMTP mail by translating domain addresses into IP addresses and verifying that both are the same.
The DNS only does a lookup on the incoming IP addresses from the SMTP mail server that attempts to connect to your site. This may not be the address of the original server. For example, if SMTP server A routes a message to SMTP server B that tries to connect to your system, Internet Services will try to resolve the IP address of SMTP server B.
When a FirstClass user sends an email message to a recipient, Internet Services sends it out using the SMTP mail protocol. This message then finds its way to the recipient’s machine through the recipient’s mail server, where the recipient’s system performs its own DNS server verification on the email address and then delivers it.
A DNS keeps a list of all domain names registered worldwide and their corresponding IP addresses.
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