Halo pak,
>Coba cari transaksinya di smtp-in log 14 April 2011 di server
>mail.quiksilver.co.id [202.155.82.218] untuk melihat connecting IP
>sender host itu berapa.
Saya sudah check log'nya, berikut log'nya.

Thu 2011-04-14 12:16:38: Accepting SMTP connection from
[58.185.152.226:19035] to [172.29.0.2:25]
Thu 2011-04-14 12:16:38: --> 220 mail.quiksilver.co.id ESMTP MDaemon 12.0.1;
Thu, 14 Apr 2011 12:16:38 +0800
Thu 2011-04-14 12:16:38: <-- EHLO mailmarshal.eventco.com
Thu 2011-04-14 12:16:38: --> 250-mail.quiksilver.co.id Hello
mailmarshal.eventco.com, pleased to meet you
Thu 2011-04-14 12:16:38: --> 250-ETRN
Thu 2011-04-14 12:16:38: --> 250-AUTH=LOGIN
Thu 2011-04-14 12:16:38: --> 250-AUTH LOGIN CRAM-MD5
Thu 2011-04-14 12:16:38: --> 250-8BITMIME
Thu 2011-04-14 12:16:38: --> 250 SIZE
Thu 2011-04-14 12:16:38: <-- MAIL FROM:<[email protected]> SIZE=28277
Thu 2011-04-14 12:16:38: Performing PTR lookup (226.152.185.58.IN-ADDR.ARPA)
Thu 2011-04-14 12:16:38: *  D=226.152.185.58.IN-ADDR.ARPA TTL=(10)
PTR=[mail.singaporewshconference.sg]
Thu 2011-04-14 12:16:38: *  D=226.152.185.58.IN-ADDR.ARPA TTL=(10)
PTR=[mail.lanxessindiaevents.com]
Thu 2011-04-14 12:16:38: *  D=226.152.185.58.IN-ADDR.ARPA TTL=(10)
PTR=[mail.siemens-apece.com.152.185.58.IN-ADDR.ARPA]
Thu 2011-04-14 12:16:38: *  D=226.152.185.58.IN-ADDR.ARPA TTL=(10)
PTR=[mail.sgbw.com.sg]
Thu 2011-04-14 12:16:38: *  D=226.152.185.58.IN-ADDR.ARPA TTL=(10)
PTR=[mail.starwoodapconference2011.com]
Thu 2011-04-14 12:16:38: *  D=226.152.185.58.IN-ADDR.ARPA TTL=(10)
PTR=[mail.eventco.com]
Thu 2011-04-14 12:16:38: *  D=226.152.185.58.IN-ADDR.ARPA TTL=(10)
PTR=[mail.eventslineup.com]
Thu 2011-04-14 12:16:38: *  D=226.152.185.58.IN-ADDR.ARPA TTL=(10)
PTR=[mail.recsingaporeopening.com]
Thu 2011-04-14 12:16:38: *  D=226.152.185.58.IN-ADDR.ARPA TTL=(10)
PTR=[mail.singaporehcsummit.com]
Thu 2011-04-14 12:16:38: *  D=226.152.185.58.IN-ADDR.ARPA TTL=(10)
PTR=[smtp.techmex.com.sg]
Thu 2011-04-14 12:16:38: *  Gathering A records...
Thu 2011-04-14 12:16:38: *  D=mail.singaporewshconference.sg TTL=(180)
A=[58.185.152.226]
Thu 2011-04-14 12:16:38: *  D=mail.lanxessindiaevents.com TTL=(180)
A=[58.185.152.226]
Thu 2011-04-14 12:16:38: *  D=mail.sgbw.com.sg TTL=(180) A=[58.185.152.226]
Thu 2011-04-14 12:16:39: *  D=mail.starwoodapconference2011.com TTL=(180)
A=[58.185.152.226]
Thu 2011-04-14 12:16:39: *  D=mail.eventco.com TTL=(105) A=[58.185.152.226]
Thu 2011-04-14 12:16:40: *  D=mail.eventslineup.com TTL=(180)
A=[58.185.152.226]
Thu 2011-04-14 12:16:40: *  D=mail.recsingaporeopening.com TTL=(180)
A=[58.185.152.226]
Thu 2011-04-14 12:16:41: *  D=mail.singaporehcsummit.com TTL=(180)
A=[58.185.152.226]
Thu 2011-04-14 12:16:42: *  D=smtp.techmex.com.sg TTL=(1440)
A=[58.185.152.226]
Thu 2011-04-14 12:16:42: ---- End PTR results
Thu 2011-04-14 12:16:42: Performing IP lookup (mailmarshal.eventco.com)
Thu 2011-04-14 12:16:43: *  Error: *  Name server reports domain name
unknown
Thu 2011-04-14 12:16:43: ---- End IP lookup results
Thu 2011-04-14 12:16:43: --> 501 <mailmarshal.eventco.com> is invalid or DNS
says does not exist
Thu 2011-04-14 12:16:43: SMTP session terminated (Bytes in/out: 76/303)
Thu 2011-04-14 12:16:43: ----------

Lalu, apa yg saya infokan ke user tersebut pak?

Salam,
-agus-


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