We've hosted exchange server with Office 365. They are providing us an smtp.office365.com with port 587 and TLS authentication, so that we can setup a relay SMTP server for internal to use Fax machine. Is there anyway you can help me or instruct me how to setup one. I used smtpdiag tool to test. Unfortunately, I can sent to google or yahoo. or live accounts, but domain. don't know what I've missed.
Thank you in advanced.