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>: 5.7.1 Unable to relayThis is due to your Exchange server configuration. My guess is that your Exchange won't allow the email to be sent without authentication--and your osTicket sending email authentication required setting is set to 'No'In my case, I could not get my osTicket to authenticate in a manner that made my Exchange 2013 server happy, regardless of the authentication required setting. Rather than continue to fight with it, I added a transport rule on my Exchange server to permit relaying from my osTicket VM (and only from my osTicket VM's IP number).