[dns-operations] Curious use of cname

[Yonghua Peng]

 Hi,

@mail.china.com does provide free email service, and they have a large number of user base.
And their MX setup:

mail.china.com. 297 IN CNAME mail.china.com.cachecn.com.
mail.china.com.cachecn.com. 97 IN MX 10 mx-mail-china-com.icoremail.net.

Will some email deliver systems break due to this setup? Thanks.





Wed, 6 Aug 2014 21:31:32 -0400 from Andrew Sullivan <ajs at anvilwalrusden.com>:
>No.  They're doing it by simulating it. The actual dns responses are a or aaaa records.  It only works under some circumstances. 
>
>A
>
>-- 
>Andrew Sullivan 
>Please excuse my clumbsy thums. 
>
>> On Aug 6, 2014, at 21:10, Yonghua Peng < sysops at mail2000.us > wrote:
>> 
>> 
>>>> >What nameserver allows this
>>> Several, every one of which apparently has to re-learn this.
>> 
>> Hi,
>> 
>> I saw Amazon Route53 has allowed this also. does it mean route53 is broken? thanks.
>> 
>> -- 
>> We are hiring cloud Dev/Ops, for more details please see:
>>  http://soa.game.yy.com/jobs.html
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