On 2/23/11 7:40 AM, Henry | Security Division wrote:

Hi Per,

you are right. I´d just like to check for missing mx records.

Here is a draft RFC about that topic "A NULL MX Resource Record means "I never accept email""

http://tools.ietf.org/html/draft-delany-nullmx-00

read the rfc again.  missing mx is not NULL mx.

The NULL MX Resource Record

To indicate that a domain never accepts email, it advertises a
solitary MX RR with a RDATA section consisting of an arbitrary
preference number 0, and a dot terminated null string as the mail
exchanger domain, to denote that there exists no mail exchanger for a
domain.



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