Helpful thoughts Steve, many thanks again to you and to all :) Today Netease has 700+ million users and a lot of servers as well as IPs, you can see all IPs and ranges from the SPF record of domain 163.com, sothat we use the format "mxx-xx.domain" for reverse dns for balance. We keep reverse dns of our IPs to comply with standards and best practises, well, SpamRats doesn't elaborate the saying "best practise" on their page which'd create confusion. If I have no luck to receive SpamRats' reply then I will try changing the reverse dns of 123.58.177.172, for example: dig +short -x 123.58.177.172 m172-177.vip.163.com.<== present mail-wmsvr2.vip.163.com.<== new Regards, -Junping 在 2016-06-14 20:47:41，"Steve Freegard" <steve.freeg...@fsl.com> 写道： On 14/06/16 13:16, "陈俊平 via mailop.org" <chenjunp...@corp.netease.com> wrote: Here're some reverse dns of big senders, they also use the format "x-x.xx.domain". $ dig +short -x 98.136.219.65 ng5-vm13.bullet.mail.gq1.yahoo.com. Doesn't contain any octets of the IP address $ dig +short -x 209.85.218.44 mail-oi0-f44.google.com. Has a single octet of the IP address but clearly shows mail- as the function. My own heuristics would allow this, can't speak for others. $ dig +short -x 17.171.37.67 mdn-txn-msbadger0502.apple.com. Again - no octets of the IP address appear within the name. Kind regards, Steve. -- Steve Freegard Development Director Fort Systems Ltd.
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