request support for tenant has exceeded threshold since friday but no agent assigned

Hi @ADMIN EXTERNE ,

5.7.705 Access denied, tenant has exceeded threshold: This error occurs when too much spam or bulk mail has been sent by your organization and we place a block on outgoing mail.

Common causes are compromised on-premises servers or compromised admin accounts that have been used to create connectors. Either condition can allow spam to pass through your organization.

 Admins can use the following reports to investigate who or what is causing the issue:

·         Mailflow status report (Outbound): https://security.microsoft.com/mailflowStatusReport?viewid=type

·         Threat protection status (spam only): https://security.microsoft.com/reports/TPSAggregateReportATP

·         Top senders and recipients: https://security.microsoft.com/reports/TopSenderRecipients

·         Outbound Connector report: https://admin.exchange.microsoft.com/#/reports/outboundconnectordetails

For more detailed information, please refer to this link：Fix email delivery issues for error codes 5.7.700 through 5.7.750 in Exchange Online | Microsoft Learn

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