DMZ blocking smtp connection

Hi,
I have a java application that send out email periodically.
The application is running on a fedora 1 apache server, recently the server was put behind a DMZ.
Before the move the java application had no issues emailing, now I am getting this error
.SmtpException: 554 <127.0.0.1>: Helo command rejected: You are not me
I've looked at reconfiguring sendmail but I'm not sure this is the issue.
I've requested sendmail to accept on all addresses
DAEMON_OPTIONS(`Port=smtp,Name=MTA’)dnl
compiled with make
and restarted sendmail
no change in the result of the java application though

thanks for the help
BFirthAsked:
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bugsaifConnect With a Mentor Commented:
Hmmm... you're server when connecting to the mail server isn't reporting its correct IP when sending the HELO command.
Check your etc/hosts file for correct hostname entries... or you could use system-config-network to setup your hostname.

Saif
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