setup SMTP in IIS6 with relay smtp

Dear Expert,

We've hosted exchange server with Office 365.  They are providing us an 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.
Who is Participating?
Vasil Michev (MVP)Connect With a Mentor Commented:
Just review this article:

You need licensed user account with Exchange license
terminator_vnAuthor Commented:
Thank you...Let me try it out and let you know the result.
terminator_vnAuthor Commented:
Excellent.  It works
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