One Comment on “Which of the following DNS record types will be used for mail transfer if the MX record is not found?”

1. flyingbird says:

   February 12, 2016 at 4:23 am

   RFC 5321 sec. 5 now clearly states that:

   1) SMTP clients must look up for an MX record;
   2) if no MX record for domain is present, look up for an A Resource Record (RR), and if such record is present, treat it as an MX record;
   3) if an MX record is present, clients MUST NOT use an A RR.

   https://portal.smartertools.com/community/a313/smarter-mail-use-a-record-if-no-mx-record-is-found.aspx

   
   
   
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