On 14-Jun-2016, at 8:56 PM, Franck Martin via mailop <mailop@mailop.org> wrote:
>
> Looking at your SPF, https://dmarcian.com/spf-survey/163.com
> <https://dmarcian.com/spf-survey/163.com>, there are not many IPs listed as
> potentially sending emails (compared to other SPF), so you should be able to
> set some specific PTR for them.
>
> Also as Suresh mentioned, if this blocking list is not blocking many emails I
> would not worry much.
163 is an email provider that I doubt provides dynamic IP space of any sort.
And as Junping says, 700 million mailboxes. Well north of 30 million, like I
said :)
Multiple /24s that can emit email on 163’s behalf - and the PTR is hardly
ip-foo.bar.baz.qux.163.com <http://163.com/> for this to be more than a tempest
in a teapot [which quite a lot of mailop threads tend to be, just like on the
old spam-l or nanae, never mind].
suresh@steelydan 21:42:20 <~> $ host -t txt spf.163.com
spf.163.com descriptive text "v=spf1 include:a.spf.163.com
include:b.spf.163.com include:c.spf.163.com include:d.spf.163.com -all"
suresh@steelydan 21:42:34 <~> $ host -t txt a.spf.163.com
a.spf.163.com descriptive text "v=spf1 ip4:220.181.12.0/22 ip4:220.181.31.0/24
ip4:123.125.50.0/24 ip4:220.181.72.0/24 ip4:123.58.178.0/24 ip4:123.58.177.0/24
ip4:113.108.225.0/24 ip4:218.107.63.0/24 ip4:123.58.189.128/25 -all"
suresh@steelydan 21:42:50 <~> $ host -t txt b.spf.163.com
b.spf.163.com descriptive text "v=spf1 ip4:176.34.21.58 ip4:176.34.53.178
ip4:121.195.178.48/28 ip4:223.252.213.0/24 -all"
suresh@steelydan 21:42:56 <~> $ host -t txt c.spf.163.com
c.spf.163.com descriptive text "v=spf1 ip4:223.252.206.0/24 ip4:43.230.90.0/27
-all"
suresh@steelydan 21:43:00 <~> $ host -t txt d.spf.163.com
d.spf.163.com descriptive text "v=spf1 ip4:123.126.65.0/24 ip4:220.181.97.0/24
ip4:180.150.142.123 ip4:180.150.142.124 ip4:180.150.154.88 ip4:180.150.154.92
ip4:180.150.154.93 ip4:103.251.128.69 -all"
—srs
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