<HTML><BODY>Hi,<br><br>@mail.china.com does provide free email service, and they have a large number of user base.<br>And their MX setup:<br><br><p>mail.china.com. 297 IN CNAME mail.china.com.cachecn.com.<br>mail.china.com.cachecn.com. 97 IN MX 10 mx-mail-china-com.icoremail.net.<br><br>Will some email deliver systems break due to this setup? Thanks.</p><br><br><br><br><br>Wed, 6 Aug 2014 21:31:32 -0400 from Andrew Sullivan <ajs@anvilwalrusden.com>:<br>
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<div id="style_14073750940000000556_BODY">No. They're doing it by simulating it. The actual dns responses are a or aaaa records. It only works under some circumstances. <br>
<br>
A<br>
<br>
-- <br>
Andrew Sullivan <br>
Please excuse my clumbsy thums. <br>
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> On Aug 6, 2014, at 21:10, Yonghua Peng <<a href="/compose?To=sysops@mail2000.us">sysops@mail2000.us</a>> wrote:<br>
> <br>
> <br>
>>> >What nameserver allows this<br>
>> Several, every one of which apparently has to re-learn this.<br>
> <br>
> Hi,<br>
> <br>
> I saw Amazon Route53 has allowed this also. does it mean route53 is broken? thanks.<br>
> <br>
> -- <br>
> We are hiring cloud Dev/Ops, for more details please see:<br>
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