> User t...@rea.co.id
> calid local user di server estate.rea.co.id?

ya.t...@rea.co.id ada di server estate.rea.co.id

> Di domain sharing server estate.rea.co.id apakah sudah
> didaftar server
> head office?
> 
> http://mdaemon.dutaint.co.id/12.0/index.html?domain_sharing.htm
> 
> Host or IP : 192.168.3.11

sudah seperti di atas setingannya pak

> Kalau sudah ada, periksa ke smtp-in log server
> estate.rea.co.id untuk
> melihat IP berapa yang digunakan server mail.rea.co.id saat
> connect.

Ip yg digunakan sudah benar IP 192.168.3.11 , berikut contoh smtp-in log

Tue 2011-07-05 16:35:47: ----------
Tue 2011-07-05 16:36:12: Session 3828; child 2; thread 0
Tue 2011-07-05 16:36:12: Accepting SMTP connection from [192.168.3.11:1485] to 
[192.168.8.8:25]
Tue 2011-07-05 16:36:12: --> 220 estate.rea.co.id ESMTP MDaemon 11.0.3; Tue, 05 
Jul 2011 16:36:12 +0800
Tue 2011-07-05 16:36:12: <-- EHLO mail.rea.co.id
Tue 2011-07-05 16:36:12: --> 250-estate.rea.co.id Hello mail.rea.co.id, pleased 
to meet you
Tue 2011-07-05 16:36:12: --> 250-ETRN
Tue 2011-07-05 16:36:12: --> 250-AUTH=LOGIN
Tue 2011-07-05 16:36:12: --> 250-AUTH LOGIN CRAM-MD5
Tue 2011-07-05 16:36:12: --> 250-8BITMIME
Tue 2011-07-05 16:36:12: --> 250-STARTTLS
Tue 2011-07-05 16:36:12: --> 250 SIZE
Tue 2011-07-05 16:36:12: <-- MAIL From:<coki.harm...@rea.co.id> SIZE=5536
Tue 2011-07-05 16:36:12: Performing Domain Sharing minger lookup 
(192.168.3.11:4069 for coki.harm...@rea.co.id)
Tue 2011-07-05 16:36:12: *  192.168.3.11 coki.harm...@rea.co.id; matched to 
cache (address is valid)
Tue 2011-07-05 16:36:12: ---- End Minger results
Tue 2011-07-05 16:36:12: --> 250 <coki.harm...@rea.co.id>, Sender ok
Tue 2011-07-05 16:36:13: <-- RCPT To:<t...@rea.co.id>
Tue 2011-07-05 16:36:13: --> 530 Authentication required
Tue 2011-07-05 16:36:13: <-- QUIT
Tue 2011-07-05 16:36:13: --> 221 See ya in cyberspace
Tue 2011-07-05 16:36:13: SMTP session terminated (Bytes in/out: 99/325)
Tue 2011-07-05 16:36:13: ----------
--[MDaemon-L]------------------------------------------------
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