DNS/RFC/1537について、ここに記述してください。

Common DNS Data File Configuration Errors    October 1993

https://tools.ietf.org/rfc/rfc1537.txt


7. Wildcard MX records

   Wildcard MX records should be avoided where possible. They often
   cause confusion and errors: especially beginning nameserver managers
   tend to overlook the fact that a host/domain listed with ANY type of
   record in a zone file is NOT covered by an overall wildcard MX record
   in that zone; 


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[[../1535]] A Security Problem and Proposed Correction With Widely Deployed DNS Software

[[../1536]] Common DNS Implementation Errors and Suggested Fixes