>OK that was corrected - and now I get another err---
>The server rejected one or more recipient addresses. The server responce was: 550 5.7.1 Unable to relay for myname@company.com
>Are there any other changes that I need to make - or am I not allowed at this company to send email?

A SMTP server could be configured in many different ways. You should talk to the person responsible for SMTP server to find what is required to use it.