Hello Team, I want to apply limit to outbound email in EOP anti-spam outbound. however, before apply any limit, I need to know the top senders, which account could be affected. I need something to help me to define the right value, should I put 500, 2,000 or 5,000, before apply any limit, I would like to know how to avoid affect the service in our organization.

You can use the Top senders report: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/reports-email-security?view=o365-worldwide#top-senders-and-recipients-report It shows data on a weekly basis, so if you need something more granular, you can build your own version of the report based on message trace data or the data from Get-MailDetailATPReport cmdlet.

EOP Anti-Spam outbound policy: how to know the top senders email before apply any limit to outbound emails

Accepted answer

Vasil Michev 100.2K Reputation points MVP

2024-03-26T17:12:58.0533333+00:00

You can use the Top senders report: https://learn.microsoft.com/en-us/microsoft-365/security/office-365-security/reports-email-security?view=o365-worldwide#top-senders-and-recipients-report

It shows data on a weekly basis, so if you need something more granular, you can build your own version of the report based on message trace data or the data from Get-MailDetailATPReport cmdlet.
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Sergio Londono 426 Reputation points

2024-03-27T13:01:28.1966667+00:00

Hello @Vasil Michev ,

Thanks for the quick answer, I checked in my tenant.

I see the top sender,
however, to apply an anti-spam outbound limit external per hour and anti-spam outbound internal, how can I get an accurate value? how can I know the normal pattern for my organization sending emails out, and then, I can apply an outbound limit?

at this moment, I don't know if 20 outbound emails I correct or 5,000 emails per hour.
the issue is if I apply a low limit, I may affect the service for some accounts and I want to detect those accounts before applying the limit.

The only way I believe we can achieve it is by asking internally if anyone who sent campaign emails and included many recipients for that email.

Vasil Michev 100.2K Reputation points MVP

2024-03-27T16:16:12.3466667+00:00

As I mentioned above, if you want to get more granular stats, you have to build your own report via PowerShell. No other way around it.

Sergio Londono 426 Reputation points

2024-03-27T20:50:54.3833333+00:00

Perfect.. I will see how we can do it.

the report you referred me to is perfect to begin the analysis.
thank you very much for the reply.
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EOP Anti-Spam outbound policy: how to know the top senders email before apply any limit to outbound emails

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