Mail Servers and DNS
This appendix provides background information on the Domain Name System (DNS) and how mail servers use the DNS. The section briefly describes the DNS, but the focus is on mail servers and the DNS records that mail servers use to find other mail servers.
If you are not familiar with how DNS operates, we recommend the book "DNS and Bind" published by O'Reilly and Associates, for general DNS information. Refer to your DNS server's documentation for information about making entries in your DNS server.
