Just finished an install of scalix-11.0.3-GA (many thanks to the help of Scalix Support "Subir") and tried sending an email message to one of the new users I added. (Message sent from outside SMTP server). I got a bounce within seconds, saying error 554. (See below.)
Any ideas on what I've done wrong?

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Reporting-MTA: dns; s2mqueue.nuttinbutnet.net
X-Postfix-Queue-ID: 8F98CBB34E
X-Postfix-Sender: rfc822; jbryan@productiveconcepts.com
Arrival-Date: Fri, 13 Apr 2007 09:48:19 -0400 (EDT)
Final-Recipient: rfc822; jbryan@mail2.productiveconcepts.com
Action: failed
Status: 5.0.0
Diagnostic-Code: X-Postfix; host mail2.productiveconcepts.com[207.40.85.50]
said: 554 <jbryan@mail2.productiveconcepts.com>: Relay access denied (in
reply to RCPT TO command)