I cannot send E-mails. It just comes back saying: 550 relay not permitted.
This is nothing to do with N360. You are using a SMTP Server in your e-mail cleinet, to send e-mails, which doesnot allow/authorize you to send e-mails through it. Please check your e-mail client's e-mail account SMTP Settings and let us know more details about it, for us to help you in solving your problem.