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Office 365 Mail SMTP Relay Issue

Hello
We are using the O365 mail relay connectors to send email from a third party software. All emails sent to O365 hosted email domains are sent and received ok. If we try to send to an non hosted O365 email domain it gets rejected. How can we setup the smtp reply to send externally from o365
I thought setting up smtp authentication may do the trick but I can't find where to set this up on the O365 admin console.
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James Danahay
Asked:
James Danahay
1 Solution
 
Dr. KlahnPrincipal Software EngineerCommented:
Can you show us the headers (detailed headers) of a rejected message, including the error message?
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James DanahayDirectorAuthor Commented:
Hello

The only error we receive is in the ERP solution itself and states that the mailbox is unavailable and the server is not responding.
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Vasil Michev (MVP)Commented:
There are few different ways to configure relay with O365, as detailed here: https://support.office.com/en-us/article/How-to-set-up-a-multifunction-device-or-application-to-send-email-using-Office-365-69f58e99-c550-4274-ad18-c805d654b4c4?ui=en-US&rs=en-001&ad=US

You should be using method 3, with the connector (either IP or certificate based).
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