From: Wietse Venema (wietseporcupine.org)
Date: Sat Oct 16 2010 - 18:02:49 CDT

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The Doctor:
> Oct 16 16:06:30 doctor doctor[31]: postfix/smtpd[23000]: NOQUEUE:
> reject: RCPT from snt0-omc1-s39.snt0.hotmail.com[65.54.61.76]:
> 554 5.7.1 <group-recipient>: Relay access denied; from=<sender>
> to=<group-recipient> proto=SMTP helo=<snt0-omc1-s39.snt0.hotmail.com>
>
> Why is this 554 error turning up?

http://www.postfix.org/postconf.5.html#reject_unauth_destination

reject_unauth_destination
    Reject the request unless one of the following is true:

        * Postfix is mail forwarder: the resolved RCPT TO domain
          matches $relay_domains or a subdomain thereof, and contains
          no sender-specified routing (userelsewheredomain),

        * Postfix is the final destination: the resolved RCPT TO
          domain matches $mydestination, $inet_interfaces,
          $proxy_interfaces, $virtual_alias_domains, or
          $virtual_mailbox_domains, and contains no sender-specified
          routing (userelsewheredomain).

    The relay_domains_reject_code parameter specifies the response
    code for rejected requests (default: 554).

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