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On 10 May 2014, at 15:57 , Glenn English <firstname.lastname@example.org> wrote:
>> May 9 15:27:44 server postfix/smtpd: NOQUEUE: reject: RCPT from 216-188-250-60.dyn.grandenetworks.net[126.96.36.199]: 554 5.7.1 <email@example.com>: Relay access denied; from=<firstname.lastname@example.org> to=<email@example.com> proto=ESMTP helo=<[192.168.129.6]>
Nothing you gave us would indicate the 188.8.131.52 should be allowed to relay.
You may also have a rule (as many admins do) to disable machines on private Subnets (like 192.168/0) from relaying.
-- I've never seen religious faith move mountains, but I've seen what it does to skyscrapers.