Office 365: Delivery Has Failed to These Recipients or Groups
When an external sender attempts to send an email message to an Office 365 group they may receive a non-delivery report with status code 5.7.133.
July 26, 2015
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Office 365 Bringing Much Needed Clarity to Email Non-Delivery Reports (NDRs)
Exchange Online (Office 365) will provide clearer, more readable non-delivery messages to help end users better understand the causes and solutions for email delivery failure.
April 16, 2015