Domain Name System (DNS) is a public resource of information about a domain that only the domain owner can edit. The DNS holds relevant details for sending email on behalf of a domain, such as SPF, DKIM, and DMARC policy records.

...почемувы уходите?я непонимаю!Ну зачем так?Постойте!
Не уходите! Дайте нам шанс!