I have installed zCS-6.0.0 on ubuntu desktop operating system, with bind9 as DNS.
I have configured Microsoft Outlook 2007 with zimbra mail server
and I can receive mails from server, but I cannot able to send a mail to users/outside network.
when I see the logs it is showing as :
Nov 27 15:02:43 mail postfix/smtpd: NOQUEUE: reject: RCPT from unknown[18.104.22.168]:
554 5.7.1 <email@example.com>: Relay access denied; from=<firstname.lastname@example.org>
to=<email@example.com> proto=ESMTP helo=<ityug3>
Thanks in Advance