On 15/02/18 10:50, Teguh Sebastian wrote:
> Saat ini ada ada domain yang setiap kami send email selalu gagal, error
> message dapat dilihat dibawah. Pertanyaannya ISP kami yang memblock Network
> mereka atau mereka yang memblock IP kami ya pak?

> [963834] <-- 550 5.7.1 Unfortunately, messages from [] weren't
> sent. Please contact your Internet service provider since part of their
> network is on our block list (AS3150). You can also refer your provider to
> http://mail.live.com/mail/troubleshooting.aspx#errors.
> [HE1EUR02FT026.eop-EUR02.prod.protection.outlook.com]

Server hotmail.com yang memblock koneksi dari IP, karena pakai
multi PTR record sehingga diragukan validitasnya.


Multiple pointer records

While most rDNS entries only have one PTR record, DNS does not restrict the
number. Multiple PTR records are used, for example, when a web server supports
many virtual hosts— i.e. multiple hostnames then resolve to a single address,
and multiple hostnames will be returned for a PTR lookup for that shared
address. However, DNS lookups typically occur over UDP, and since UDP has a
limited message size, in extreme cases, multiple PTRs could cause a DNS response
to exceed those UDP limits.

$ host domain name pointer mail.ciputrahospital.com. domain name pointer mail.ciputra.co.id.

Perbaiki PTR recordnya menjadi satu saja. domain name pointer mail.ciputra.co.id

dan di domain manager ciputrahospital.com di set smtp hostname = 


setelah itu request delist ke hotmail.com melalui webform berikut


> [963834] *  DNS: 10 second wait for DNS response exceeded (DNS Server: 

Adjust idle time out untuk DNS query karena terlalu singkat, naikkan 6 kalinya.


Wait 60 seconds for MX responses
Wait 60 seconds for A/AAAA responses

Syafril Hermansyah
MDaemon-L Moderators, running MDaemon 17.5.2-64, SP 5.5-64
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