I have an exchange server 2013 as primary behind is the zimbra 8.0.3
zimbra hostname: mail4.grupoepensa.pe
hostname exchange: holanda.grupoepensa.pe
My exchange can send internal and external email, the Zimbra can send and receive emails from the exchange, but when zimbra send emails to the internet using the connector sending and reception of exchange, shows the following error.
<email@example.com>: host holanda.grupoepensa.pe [172.16.6.14] said: 550
5.7.1 Unable to relay (in reply to RCPT TO command)
I followed the steps showing zimbra wiki and created the corresponding connectors on receipt and shipping and still shows me the error.