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Emails aren't being sent via DecileHub after connecting and wanting to send through Microsoft365 business account
Your message wasn't delivered because the recipient's email provider rejected it.

Diagnostic information for administrators:
Remote server returned '550 5.7.708 Service unavailable. Access denied, traffic not accepted from this IP.
3 replies
Where did you see this message? Was it in Hub or in your Microsoft365 inbox? 
It appears to be an issue when running a trial with Microsoft365. After emailing the Microsoft team they were able to resolve it. 

This NDR is generated if you send an email message from an IP address that has a low reputation. The issue is more likely to affect new customers, such as those who have a Microsoft 365 trial subscription.

How do I fix this?

Only an email admin in your organization can fix this issue.
If you're an email admin, and you receive this error during a trial subscription
, contact Microsoft Support to request an IP address exception until you assign Exchange Online licenses.
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