Can Exchange be set up to send emails from printers (Print to email) to an outside email (another domain)?

Hello

if cant set enable auth on printer need anonymous relay connector:
https://technet.microsoft.com/en-us/library/bb232021%28v=exchg.141%29.aspx
if can only change anonymous permission to specified service acc..

Step by step to configure External SMTP relay for this purpose with explanation:  http://exchangeserverpro.com/exchange-2013-configure-smtp-relay-connector/