"Delivery has failed to these recipients or groups" when sending emails in FYI

I can send emails directly from Outlook but when sending an email from within FYI I am getting the following error:

"Delivery has failed to these recipients or groups: email address
Your message wasn't delivered because the recipient's email provider rejected it."

This error can happen when you are trying out a Microsoft 365 trial tenant.

If you receive this error before you can purchase licenses, you will need to purchase a full Microsoft 365 license.
Refer also to the following Microsoft article Fix NDR error "550 5.7.700" through "550 5.7.750" in Exchange Online


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