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[cobalt-developers] Undelivered Mail Returned to Sender



Just added a site on a RaQ 550. Tried to send email to that domain but the message failed. The error message was:

The Postfix program

<dan@xxxxxxxxxx>: host DOMAIN.org[IP.IP.IP.IP] said: 550 5.7.1
    <dan@xxxxxxxxxx>... Relaying denied.  Please check your mail first or
    restart your mail session.

I had this problem before but I just need a small hint to remind me what's wrong and what I have to do to fix this.