Tech W. wrote:
What will be happened if a MX is an numeric IP?
for example,
# dig vip.online2.sh.cn mx +short
10 218.1.71.125.
It's syntactically valid.
But, since there is no "125" top-level domain, or, obviously, any
subdomains of of that domain, semantically it's incorrect.
To put it another way, it's a correctly-formed record, pointing at
something that doesn't exist.
It's also a flag that expresses "hey everybody, I don't know how to edit
zone files properly!".
- Kevin
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