Now I found the relay access denied problem. First, I have mail server at my office and I have dedicated server at USA. At dedicated server I use webserver and smtp service. For smtp service I have send email to customer and BCC to my email address.
The relay access denied problem was from I send email from dedicated server to my mailserver at office but send to customer have no probem. Please check in return email :
From: System Administrator [mailto:firstname.lastname@example.org]
Sent: Wednesday, July 05, 2006 7:21 PM
Subject: Undeliverable: Hotel Voucher
Subject: Hotel Voucher
Sent: Wed, 5 Jul 2006 19:02:37 +0700
did not reach the following recipient(s):
MailTemplate on Wed, 5 Jul 2006 19:19:36 +0700
There was a SMTP communication problem with the recipient's email server. Please contact your system administrator.
<DH8.dwh.inter.net #5.5.0 smtp;554
<email@example.com>: Relay access denied>
firstname.lastname@example.org is email adress which I send from dedicated server
email@example.com is customer email address (no problem)
DH8.dwh.inter.net is dedicated server name.
firstname.lastname@example.org is my email address which have BCC when dedicated server send email out to customer.
On exchange server at my office I already add dedicated server IP to have permission to relay on the server.
I'm not sure for the problem.