Issues with sending mail after install

[Andrew Wafaa]

Hi,

I've just setup a new Kolab instance on openSUSE using the Stable repo
- great work and thanks for that (install went flawlessly).

I've hit an issue though that prevents me from sending mail, well
actually it prevents the mail from being received. When sending mail
the server identifies itself as localhost.localdomain instead of
foo.org. How do I fix this issue? I know it should be fairly easy, but
for whatever reason I can't work it out.

Here is the bounce I received:

This is the mail system at host localhost.

I'm sorry to have to inform you that your message could not
be delivered to one or more recipients. It's attached below.

For further assistance, please send mail to postmaster.

If you do so, please include this problem report. You can
delete your own text from the attached returned message.

                   The mail system

<awafaa at opensuse.org>: host mx2.example.org[XXX.XXX.XX.XX] said: 554
<localhost>:
    Helo command rejected: "You are not localhost" (in reply to RCPT TO
    command)

Reporting-MTA: dns; localhost
X-Postfix-Queue-ID: 7AA12280BC3
X-Postfix-Sender: rfc822; me at foo.org
Arrival-Date: Wed,  3 Jul 2013 11:51:11 +0100 (BST)

Final-Recipient: rfc822; user at example.org
Original-Recipient: rfc822;user at example.org
Action: failed
Status: 5.0.0
Remote-MTA: dns; mx2.example.org
Diagnostic-Code: smtp; 554 <localhost>: Helo command rejected: "You are not
    localhost"

Thanks,

Andy

--
Andrew Wafaa
GPG: 0x3A36312F