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Error message when users try to send email messages through Forefront Online Protection for Exchange: "Too much email from <IP address>"

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Symptoms

When Microsoft Online Services users try to send email messages through Microsoft Forefront Online Protection for Exchange (FOPE), they receive a nondelivery report (NDR) that contains the following error message from the FOPE data center:
Too much email from <IP address>

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Cause

This issue occurs if the connection is rejected by the FOPE network. The FOPE network starts to reject connections if one of the following conditions is true:
  • A connecting on-premises mail server makes more than 50 connections in one minute.
  • A connecting on-premises mail server sends more than 50 messages in one minute.

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Resolution

To resolve this issue, configure the on-premises server that sends the email messages to meet both of the following conditions:
  • The server sends less than 50 email messages for each connection.
  • The server uses less than 50 concurrent connections to deliver mail to or through Microsoft Online Services.

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More information

For more information about how to configure FOPE, visit the following Microsoft TechNet website:
Best Practices for Configuring FOPE


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Keywords: KB2652159, o365, vkbportal237, vkbportal231, vkbportal225

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Article Info
Article ID : 2652159
Revision : 7
Created on : 6/14/2013
Published on : 6/14/2013
Exists online : False
Views : 338