Office 365 and SMTP 550 5.7.60

When setting up SMTP on our voicemail system, I receive error "550 5.7.60 SMTP; Client does not have permissions to send as this sender". When configuring the voicemail system, there is a test email config. The test pasts and the email is delivered. However, when voicemails are attempted to be sent to the users mailbox, the above error occurs. I've set up SMTP using O365 smart host of smtp.office365.com following Microsoft's relay instructions. TLS is selected, and it uses an authenticated user that has a licensed mailbox and is a global administrator. What am I missing?
HELFITAsked:
Who is Participating?

Improve company productivity with a Business Account.Sign Up

x
 
Vasil Michev (MVP)Connect With a Mentor Commented:
Global administrators dont automatically get Send As/Send on behalf rights on other mailboxes, and it looks like your voicemail system is trying to to just that. You can test by granting Send As to one test account and do the voicemail test.
0
Question has a verified solution.

Are you are experiencing a similar issue? Get a personalized answer when you ask a related question.

Have a better answer? Share it in a comment.

All Courses

From novice to tech pro — start learning today.