>$ host 202.168.95.6 ns1.dutaint.com
>Using domain server:
>Name: ns1.dutaint.com
>Address: 203.130.233.3#53
>Aliases:

>6.95.168.202.in-addr.arpa domain name pointer mail1.nprc.mschkg.com.
>6.95.168.202.in-addr.arpa domain name pointer mail1.sprc.mschkg.com.
>6.95.168.202.in-addr.arpa domain name pointer mail1.mschkg.com.
>6.95.168.202.in-addr.arpa domain name pointer mail1.mscmawandepot.com.
>6.95.168.202.in-addr.arpa domain name pointer mail1.msccruisesasia.com.

Untuk up yang 202.168.95.6, saya sudah tambahkan ke white list tapi kok
tetap saja terblock ya.
Terlampir log SMTP-IN nya..

--[MDaemon-L]------------------------------------------------
Milis ini untuk Diskusi antar pengguna MDaemon Mail Server.

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Versi terakhir MD 12.5.2, SP 4.1.3, OC 2.2.9, SG 2.0.6, PP 2.0.0
Fri 2012-01-13 14:16:42: Accepting SMTP connection from [202.168.95.6:3192] to 
[192.168.0.3:25]
Fri 2012-01-13 14:16:42: --> 220 mail.mscid.com ESMTP MDaemon 12.5.0; Fri, 13 
Jan 2012 14:16:42 +0700
Fri 2012-01-13 14:16:42: <-- EHLO mschkg.com
Fri 2012-01-13 14:16:42: --> 250-mail.mscid.com Hello mschkg.com, pleased to 
meet you
Fri 2012-01-13 14:16:42: --> 250-ETRN
Fri 2012-01-13 14:16:42: --> 250-AUTH LOGIN CRAM-MD5 PLAIN
Fri 2012-01-13 14:16:42: --> 250-8BITMIME
Fri 2012-01-13 14:16:42: --> 250 SIZE
Fri 2012-01-13 14:16:42: <-- MAIL FROM:<[email protected]> SIZE=215103
Fri 2012-01-13 14:16:42: Performing PTR lookup (6.95.168.202.IN-ADDR.ARPA)
Fri 2012-01-13 14:16:42: *  D=6.95.168.202.IN-ADDR.ARPA TTL=(1155) 
PTR=[mail1.nprc.mschkg.com]
Fri 2012-01-13 14:16:42: *  D=6.95.168.202.IN-ADDR.ARPA TTL=(1155) 
PTR=[mail1.sprc.mschkg.com]
Fri 2012-01-13 14:16:42: *  D=6.95.168.202.IN-ADDR.ARPA TTL=(1155) 
PTR=[mail1.mschkg.com]
Fri 2012-01-13 14:16:42: *  D=6.95.168.202.IN-ADDR.ARPA TTL=(1155) 
PTR=[mail1.mscmawandepot.com]
Fri 2012-01-13 14:16:42: *  D=6.95.168.202.IN-ADDR.ARPA TTL=(1155) 
PTR=[mail1.msccruisesasia.com]
Fri 2012-01-13 14:16:42: *  Gathering A records...
Fri 2012-01-13 14:16:42: *  D=mail1.nprc.mschkg.com TTL=(38) A=[202.168.95.9]
Fri 2012-01-13 14:16:42: *  D=mail1.sprc.mschkg.com TTL=(12) A=[202.168.95.7]
Fri 2012-01-13 14:16:42: *  D=mail1.mschkg.com TTL=(12) A=[202.168.95.5]
Fri 2012-01-13 14:16:42: *  D=mail1.mscmawandepot.com TTL=(1155) 
A=[202.168.95.13]
Fri 2012-01-13 14:16:42: *  D=mail1.msccruisesasia.com TTL=(1155) 
A=[202.168.95.11]
Fri 2012-01-13 14:16:42: *  MDaemon configured to drop connection on PTR record 
miss-match
Fri 2012-01-13 14:16:42: ---- End PTR results
Fri 2012-01-13 14:16:42: --> 501 Domain must resolve
Fri 2012-01-13 14:16:42: SMTP session terminated (Bytes in/out: 64/222)
--[MDaemon-L]------------------------------------------------
Milis ini untuk Diskusi antar pengguna MDaemon Mail Server.

Netiket: <http://www.netmeister.org/news/learn2quote>
Arsip: <http://mdaemon-l.dutaint.com>
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Henti Langgan: Kirim mail ke MDaemon-L-unsubscribe [at] dutaint.com
Berlangganan: kirim mail ke MDaemon-L-subscribe [at] dutaint.com
Versi terakhir MD 12.5.2, SP 4.1.3, OC 2.2.9, SG 2.0.6, PP 2.0.0

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