Dear Pak Syafril

ada client kami yang kirim email selalu gagal, setalah saya cek di log
smtp(in) seperti nya hostname mail nya tidak sesuai dengan hostname ip
ptr nya.
apa yang harus di lakukan agar email client dapat di terima oleh  mail
server  kami.
berikut saya lampirkan log smtp(in)

Terima Kasih

Wed 2013-05-22 12:09:27: [20189:2] Session 20189; child 2
Wed 2013-05-22 12:09:27: [20189:2] Accepting SMTP connection from
[199.6.154.23:49254] to [202.152.27.180:25]
Wed 2013-05-22 12:09:27: [20189:2] --> 220 mail.elnusa.co.id ESMTP
MDaemon 13.0.4; Wed, 22 May 2013 12:09:27 +0700
Wed 2013-05-22 12:09:27: [20189:2] <-- EHLO nl0105mta02.mail.slb.com
Wed 2013-05-22 12:09:27: [20189:2] --> 250-mail.elnusa.co.id Hello
nl0105mta02.mail.slb.com, pleased to meet you
Wed 2013-05-22 12:09:27: [20189:2] --> 250-ETRN
Wed 2013-05-22 12:09:27: [20189:2] --> 250-AUTH LOGIN CRAM-MD5 PLAIN
Wed 2013-05-22 12:09:27: [20189:2] --> 250-8BITMIME
Wed 2013-05-22 12:09:27: [20189:2] --> 250 SIZE 5120000
Wed 2013-05-22 12:09:28: [20189:2] <-- MAIL FROM:<[email protected]> SIZE=8886
Wed 2013-05-22 12:09:28: [20189:2] Performing PTR lookup
(23.154.6.199.IN-ADDR.ARPA)
Wed 2013-05-22 12:09:28: [20189:2] *  D=23.154.6.199.IN-ADDR.ARPA
TTL=(1320) PTR=[mail.slb.com]
Wed 2013-05-22 12:09:28: [20189:2] *  Gathering A records...
Wed 2013-05-22 12:09:28: [20189:2] *  D=mail.slb.com TTL=(60) A=[199.6.154.23]
Wed 2013-05-22 12:09:28: [20189:2] *  D=mail.slb.com TTL=(60) A=[136.250.9.132]
Wed 2013-05-22 12:09:28: [20189:2] *  D=mail.slb.com TTL=(60) A=[136.250.9.133]
Wed 2013-05-22 12:09:28: [20189:2] *  D=mail.slb.com TTL=(60) A=[199.6.139.31]
Wed 2013-05-22 12:09:28: [20189:2] *  D=mail.slb.com TTL=(60) A=[199.6.154.22]
Wed 2013-05-22 12:09:28: [20189:2] ---- End PTR results
Wed 2013-05-22 12:09:28: [20189:2] Performing IP lookup
(nl0105mta02.mail.slb.com)
Wed 2013-05-22 12:09:28: [20189:2] *  Error: *  Name server reports
domain name unknown
Wed 2013-05-22 12:09:28: [20189:2] ---- End IP lookup results
Wed 2013-05-22 12:09:28: [20189:2] --> 501 <nl0105mta02.mail.slb.com>
is invalid or DNS says does not exist
Wed 2013-05-22 12:09:28: [20189:2] SMTP session terminated (Bytes
in/out: 71/295)
-- 
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