[OGo-Outlook] 554 error when sending mail from Outlook or other email client

[outlook@opengroupware.org]

<P>Hi,</P>
<P>I installed InstantOGo and everything seemed to work fine. Emailing from the
web interface is no problem. Installing the ZideLook licence went smoothly. The
lack of documentation and my inexperience with Linux was a time consuming
factor.</P>
<P>My main problem at the moment is that I am unable to email from Outlook. I
setup Imap access to my email server. All messages are downloaded fine. When I
send a message I get this nasty 554 error: relay not permitted. From what I
understand this is a general Postfix error and can mean many things. Someone
installed Webmin for me on the OGo server, so I have a GUI like access to it. I
am a Linux novice though, and your help in getting rid of the 554 error would be
highly appreciated. </P>
<P>(This message is sent from the OGo web interface which works fine.) I emailed
Skyrix but they have not replied (yet).</P>
<P>Michiel</P>