How does DNS work?

Overview DNS maps a hostname (comprised of a domain name + optional subdomain, e.g. example.com or www.example.com) to an addressable machine (by IP address) somewhere on the Internet. DNS works by issuing multiple queries, recursively, until the machine address is resolved. Process Initial query Of a most trivial example, let’s assume a browser accesses http://example.com for…

Authorizing hostnames to handle e-mail

Overview A hostname, combination of optional subdomain and mandatory domain, may be configured to act as an e-mail domain, ie. receive e-mails on that host. These hostnames are added via Mail > Mail Routing. For any domain present there, the server will act as the final destination bypassing MX lookups. This will result in problems if…