Pak Syafril,

Berikut log email yang tidak bisa masuk ke email server kami.
Saya coba analisa, harusnya mereka memakai:

Non-authoritative answer:
arcelormittal.com       MX preference = 10, mail exchanger =
mx2.arcelormittal.com
arcelormittal.com       MX preference = 10, mail exchanger =
mx1.arcelormittal.com

mx2.arcelormittal.com   internet address = 194.154.218.8
mx1.arcelormittal.com   internet address = 194.154.218.7

012-07-03 10:24:11: [5296:1] Session 5296; child 1
Tue 2012-07-03 10:24:11: [5296:1] Accepting SMTP connection from
[194.154.218.14:13446] to [192.168.1.248:25]
Tue 2012-07-03 10:24:11: [5296:1] --> 220 mail.heibatam.com ESMTP
MDaemon 12.5.2; Tue, 03 Jul 2012 10:24:11 +0700
Tue 2012-07-03 10:24:11: [5296:1] <-- EHLO out2.arcelormittal.com
Tue 2012-07-03 10:24:11: [5296:1] --> 250-mail.heibatam.com Hello
out2.arcelormittal.com, pleased to meet you
Tue 2012-07-03 10:24:11: [5296:1] --> 250-ETRN
Tue 2012-07-03 10:24:11: [5296:1] --> 250-AUTH LOGIN CRAM-MD5 PLAIN
Tue 2012-07-03 10:24:11: [5296:1] --> 250-8BITMIME
Tue 2012-07-03 10:24:11: [5296:1] --> 250 SIZE
Tue 2012-07-03 10:24:12: [5296:1] <-- MAIL
FROM:<[email protected]> SIZE=12414
Tue 2012-07-03 10:24:12: [5296:1] Performing PTR lookup
(14.218.154.194.IN-ADDR.ARPA)
Tue 2012-07-03 10:24:13: [5296:1] *  D=14.218.154.194.IN-ADDR.ARPA
TTL=(1440) PTR=[out2.arcelormittal.com]
Tue 2012-07-03 10:24:13: [5296:1] *  Gathering A records...
Tue 2012-07-03 10:24:13: [5296:1] *  D=out2.arcelormittal.com
TTL=(240) A=[194.154.218.14]
Tue 2012-07-03 10:24:13: [5296:1] ---- End PTR results
Tue 2012-07-03 10:24:13: [5296:1] Performing IP lookup (out2.arcelormittal.com)
Tue 2012-07-03 10:25:13: [5296:1] *  DNS: 60 second wait for DNS
response exceeded (DNS Server: 202.134.0.155)
Tue 2012-07-03 10:25:14: [5296:1] *  D=out2.arcelormittal.com
TTL=(240) A=[194.154.218.14]
Tue 2012-07-03 10:25:14: [5296:1] ---- End IP lookup results
Tue 2012-07-03 10:25:14: [5296:1] Performing IP lookup (ARCELORMITTAL.COM)
Tue 2012-07-03 10:25:15: [5296:1] *  D=ARCELORMITTAL.COM TTL=(240)
A=[195.46.252.6]
Tue 2012-07-03 10:26:15: [5296:1] *  DNS: 60 second wait for DNS
response exceeded (DNS Server: 202.134.0.155)
Tue 2012-07-03 10:27:15: [5296:1] *  DNS: 60 second wait for DNS
response exceeded (DNS Server: 203.130.193.74)
Tue 2012-07-03 10:27:15: [5296:1] ---- End IP lookup results
Tue 2012-07-03 10:27:15: [5296:1] --> 501 <ARCELORMITTAL.COM> does not
have an MX record
Tue 2012-07-03 10:27:15: [5296:1] SMTP session terminated (Bytes in/out: 82/267)

Terima kasih.
--[MDaemon-L]------------------------------------------------
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