NPrinting does not use Microsoft Office to send e-mails. You enter your SMTP server details like Server address/IP and port and NPrinting simply sends e-mails there using the credentials you provide for authentication. Of course you will need Office to author Word, Excel and PowerPoint reports and also to consume them. Trial version works as well. Take a look at the minimum requirements for NPrinting 17 here: https://help.qlik.com/en-US/nprinting/17.0/Content/DeployingQVNprinting/System-requirements.htm
HTH - Daniel.