Pak Syafril,
Mohon bantuan updatenya untuk log berikut :

Tue 2013-09-17 13:23:32: [43106:1] Session 43106; child 1
Tue 2013-09-17 13:23:32: [43106:1] Accepting SMTP connection from [103.247.226.50:48487] to [113.11.130.172:25] Tue 2013-09-17 13:23:32: [43106:1] --> 220 mx.saranainstrument.com ESMTP MDaemon 13.0.5; Tue, 17 Sep 2013 13:23:32 +0700
Tue 2013-09-17 13:23:32: [43106:1] <-- EHLO TGIJKTCAS01.intra.tgi.co.id
Tue 2013-09-17 13:23:32: [43106:1] --> 250-mx.saranainstrument.com Hello TGIJKTCAS01.intra.tgi.co.id, pleased to meet you
Tue 2013-09-17 13:23:32: [43106:1] --> 250-ETRN
Tue 2013-09-17 13:23:32: [43106:1] --> 250-AUTH LOGIN CRAM-MD5 PLAIN
Tue 2013-09-17 13:23:32: [43106:1] --> 250-8BITMIME
Tue 2013-09-17 13:23:32: [43106:1] --> 250-STARTTLS
Tue 2013-09-17 13:23:32: [43106:1] --> 250 SIZE 15360000
Tue 2013-09-17 13:23:32: [43106:1] <-- MAIL FROM:<[email protected]> SIZE=15444 Tue 2013-09-17 13:23:32: [43106:1] Performing PTR lookup (50.226.247.103.IN-ADDR.ARPA) Tue 2013-09-17 13:23:32: [43106:1] * Error: * Name server reports domain name unknown Tue 2013-09-17 13:23:32: [43106:1] * MDaemon configured to drop connection when domain name unknown
Tue 2013-09-17 13:23:32: [43106:1] ---- End PTR results
Tue 2013-09-17 13:23:32: [43106:1] --> 501 Connecting IP must have valid PTR record for 103.247.226.50 Tue 2013-09-17 13:23:32: [43106:1] SMTP session terminated (Bytes in/out: 87/320)

Ada yang ingin saya tanyakan Pak,
Dengan settingan MD cek PTR, beberapa email customer tidak bisa masuk ke server kita gara2 server mereka settingan salah dan apalagi email tsb penting. Dan setelah sdh didaftarkan di whitelist, settingan server mereka berubah lagi sehingga tidak msk lagi (seperti log diatas). Sehingga ada user saya yang komplain dengan settingan server kantor, kenapa settingan seperti itu dan harus didaftarkan di whitelist. Yang ingin saya tanyakan, bagaimana cara menjelaskan ke user yang tidak mengerti (awam) tentang settingan tsb Pak ?

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Regards,
*Yudis*
*IT Officer*
+62-21-5347855
Ext.321

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