How do i find out which threshold is being exceed in outlook_

Jose Avila 0 Reputation points

I have a user who every now and then is being blocked form sending emails. He is using a 3rd party provider to help send bulk emails. Per usage reports on MS365 admin center he only sends between 8k to 9k but when you run a trace there are no more then 700 emails being sent daily. So what is causing the problem and how do i track it?

Thank you,

Jose Avila

A family of Microsoft email and calendar products.
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  1. Kael Yao-MSFT 33,861 Reputation points Microsoft Vendor

    Hi @Jose Avila,

    Here is a Microsoft documentation about the sending limit in Exchange Online.

    For your reference: Sending limits

    Besides, does this user get a NDR message if he tries to send emails in Outlook or Outlook on the web?

    If yes, what is the rejection reason in the NDR message?

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