当使用配置为发送RUA的DMARC子域时，是否需要添加DMARC报告TXT记录？

Question

如果我在username@subdomain.example.com的DMARC记录中用rua=username@example.com发送电子邮件，是否需要创建DMARC报告TXT记录(例如subdomain.example.com._report._dmarc.example.com TXT "v=DMARC1")？

Answer 1

不，根据RFC的说法：

When a Mail Receiver discovers a DMARC policy in the DNS, and the
   Organizational Domain at which that record was discovered is not
   identical to the [Organizational Domain][2] of the host part of the
   authority component of a [URI] specified in the "rua" or "ruf" tag,
   the following verification steps are to be taken:

 1.  Extract the host portion of the authority component of the URI.
       Call this the "destination host", as it refers to a Report
       Receiver.

 2.  Prepend the string "_report._dmarc".

2