[RFCI-Discuss] about FQDN for our smtp servers

[Jeff Pang]

Thanks Alex.When the other site receive the HELO command from one IP of our MTAs,does it verify the IP by ptr record,or by A record following the HELO command?

Yes,smtp.163.split.netease.com is a split DNS used to do the balance between different ISPs.For example,the China Telecom's users should access smtp.163.split.netease.com via these IPs:
11.11.11.11
22.22.22.22
...

But China Network Communication's users should access the same domain name via other IPs:
33.33.33.33
44.44.44.44





-----Original Message-----
>From: Alex van den Bogaerdt <alex at ergens.op.het.net>
>Sent: Apr 11, 2006 8:03 AM
>To: Discussion about the RFC-Ignorant Project <rfci-discuss at lists.megacity.org>
>Subject: Re: [RFCI-Discuss] about FQDN for our smtp servers
>
>On Tue, Apr 11, 2006 at 01:43:08AM -0400, Jeff Pang wrote:
>
>> >One of the five A records attached to node smtp.163.split.netease.com
>> >also points to IP address 202.108.5.81 but I don't think you need
>> >a PTR record pointing back to this name.  I know some disagree.
>> >
>> 
>> Helo,Alex.Thank you very much for your kind explaining.
>> But the above words said by you get me a little confused.Why we don't need a ptr record here?Thanks again.
>
>Because you want the PTR record to point at a host name, and
>smtp.163.split.netease.com is not a host name.
>Remember: I had to guess smtp.163.split.netease.com is a name you
>use to reach five hosts (I was assuming some round robin technique).
>If that guess isn't accurate, my statements isn't as well.
>
>Anyway, this is not the RFCT list (t for tutorial).  I suggest buying
>books and taking courses.  Or you can hire someone that knows how to
>do this kind of stuff.
>
>Alex
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--
Jeff Pang
NetEase AntiSpam Team
http://corp.netease.com