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Titre
Access denied tenant has exceeded threshold -
Description
When sending email with co-existence enabled a non delivery report (NDR) is being returned to the sender.
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Cause
The tenant exceeded the mail threshold for the daily limit imposed by the vendor.
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Résolution
The error is found by logging into Exchange Online and performing a Message Trace.
Event: FailDetail: Reason 550.5.7.705 Access denied, tenant has exceeded threshold.
For this issue the vendor recommends following the article below and reaching out to Microsoft support if not resolved.
https://docs.microsoft.com/en-us/office365/troubleshoot/antispam/tenant-has-exceeded-threshold