Dear Pak Syafril,
Salah satu klien kami tidak bisa terima email dari salah satu vendor dengan 
error sbb:
Wed 2016-02-24 17:01:26: ----------
Wed 2016-02-24 17:01:59: [627333] Session 627333; child 0001
Wed 2016-02-24 17:01:59: [627333] Accepting SMTP connection from 
[103.225.89.45:57180] to [121.58.186.20:25]
Wed 2016-02-24 17:01:59: [627333] --> 220 mail.atletcentury.com ESMTP MDaemon 
14.0.0; Wed, 24 Feb 2016 17:01:59 +0700
Wed 2016-02-24 17:01:59: [627333] <-- EHLO imsva.ibsmulti.com
Wed 2016-02-24 17:01:59: [627333] --> 250-mail.atletcentury.com Hello 
imsva.ibsmulti.com, pleased to meet you
Wed 2016-02-24 17:01:59: [627333] --> 250-ETRN
Wed 2016-02-24 17:01:59: [627333] --> 250-AUTH LOGIN CRAM-MD5 PLAIN
Wed 2016-02-24 17:01:59: [627333] --> 250-8BITMIME
Wed 2016-02-24 17:01:59: [627333] --> 250 SIZE
Wed 2016-02-24 17:01:59: [627333] <-- MAIL 
FROM:<alphaliyanri.las...@ibsmulti.com> SIZE=574169 BODY=7BIT
Wed 2016-02-24 17:01:59: [627333] Performing PTR lookup 
(45.89.225.103.IN-ADDR.ARPA)
Wed 2016-02-24 17:02:00: [627333] *  Error: *  Name server reports domain name 
unknown
Wed 2016-02-24 17:02:00: [627333] *  MDaemon configured to drop connection when 
domain name unknown
Wed 2016-02-24 17:02:00: [627333] ---- End PTR results
Wed 2016-02-24 17:02:00: [627333] --> 501 Connecting IP must have valid PTR 
record for 103.225.89.45
Wed 2016-02-24 17:02:00: [627333] SMTP session terminated (Bytes in/out: 93/283)
Wed 2016-02-24 17:02:00: ----------
Bisa tolong di update di dalam whitelist PTR record nya pak.

Salam,

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