Use DNS to Validate Domain Ownership - AWS Certificate Manager.
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A Service record (SRV record) is a specification of data in the Domain Name System defining the location, i.e., the hostname and port number, of servers for specified services. It is defined in RFC 2782, and its type code is 33.Some Internet protocols such as the Session Initiation Protocol (SIP) and the Extensible Messaging and Presence Protocol (XMPP) often require SRV support by network.
There is a recommendation that the SOA serial number use a format that is four digits of year, two digits of month, two digits of day and two digits of count of changes in the same day. This format is common, but far from universal (look at .COM for a high-profile example of a zone that doesn't).
General DNS Rules The Points To value cannot be blank. While a Host Name can have multiple parts, each part cannot be more than 63 characters. The full record name (the Host Name and the Domain Name) cannot be more than 255 characters.
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Common SPF syntax errors are: Mechanisms that perform DNS lookups (mx, a, ptr, exists, redirect, include) contain text rather than domains or hostnames; Mechanisms contain a numerical value, when they require a domain or hostname; Format of IP addresses for ip4 and ip6 mechanisms is incorrect; Full list of SPF Mechanisms and examples.