question

JerrySu-1371 avatar image
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JerrySu-1371 asked AndyDavid commented

limited a sender or IP to be able to send 20 emails in 10 minutes only

halo,

as title, I wondering how to limit a sender or IP to be able to send 20 emails in 10 minutes only?

the limited should effect on outside sender only , the internal user should not be limited.

thanks :)



office-exchange-server-administration
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AndyDavid avatar image
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AndyDavid answered AndyDavid edited

Sorry, no such specific setting in Exchange itself. You may want to look at your anti-spam solution on a SMTP gateway to see if that capability exists.

You can look at the message throttling options here:

https://docs.microsoft.com/en-us/exchange/mail-flow/message-rate-limits?view=exchserver-2019#:~:text=Message%20throttling%20refers%20to%20a,and%20SMTP%20session%20timeout%20values.&text=Mailbox%20servers%20and%20Edge%20Transport%20servers.

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JerrySu-1371 avatar image
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JerrySu-1371 answered

BTW, I know Set-ReceiveConnector has properties : MessageRateLimit and MessageRateSource
but, the message limited by per minute which is not achieve my requirement. I want to the time slot can be settable. e.g. 10 minutes or 1 hour.

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JerrySu-1371 avatar image
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JerrySu-1371 answered AndyDavid commented

thanks for the reply.
I wondering in Set-ReceiveConnector -MessageRateLimit , how to count the message?
e.g. one external client send an email to my company with 5 recipients and cc to 10 recipients.
show to count the message in this case, 1 message? 5 message ? 15 message ?
thanks!

BTW, we using symantec message gateway and they said this should do on exchange side. :) interesting hahaha

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One message in that case.

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EricYin-MSFT avatar image
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EricYin-MSFT answered

The time slot is not settable in Exchange, you should look for third-party tools or scripting something.


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JerrySu-1371 answered AndyDavid commented

does anyone know the messages definition ? by message id or by what ?

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Message limit would be per message from the same IP for messages from the internet. Each message should have a unique message ID, but thats not how its governed.

From that doc I linked:

IPAddress on the following default Receive connectors:
• Default <ServerName> in the Transport service on Mailbox servers.
• Default Frontend <ServerName> in the Front End Transport service on Mailbox servers.
• Outbound Proxy Frontend <ServerName> in the Front End Transport service on Mailbox servers.
• Default internal Receive connector <ServerName> on Edge Transport servers.

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@hi @JerrySu-1371
Any updates? Please mark any answer as accepted so we can close this up. Thank you!

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