i have the same problem server2.027
Sending test mail failed. Error: Failed sending data to the peer(ec=55), RCPT failed: 550
i have a lokal Exchange 2013 server port 25 open for all internal adreses
Do you have a recive connector configured for your urbackup servers IP?
Are you trying to send email from an internal email address to an external address? If so, you may need to configure a relay.
These are the directions to setup the relay. (edit: the powershell portion at the bottom is the most important part)
https://glazenbakje.wordpress.com/2012/12/30/exchange-2013-how-to-configure-an-internal-relay-connector/
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