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Rate Limit settings for Inbound and Outbound of Trend Micro Email Security (TMEMS)

    • Updated:
    • 16 Sep 2021
    • Product/Version:
    • Hosted Email Security All
    • Trend Micro Email Security All
    • Platform:
Summary

This article describes the rate limits implemented by TMEMS, for both outbound and inbound mails.

Details
Public

Rate Limit Settings

  • For inbound traffic, the rate limit is based on sender IP and recipient.
  • For outbound traffic, the rate limit is based on sender IP and sender.
DirectionBy IP addressBy email address
Inbound500 messages per minute per sender IP address200 messages per minute per recipient email address
Outbound1,000 messages per 5 minutes per sender IP address500 messages per 10 minutes per sender email address

If any of these rate limits is reached, message delivery will be delayed until the rate goes below the limit at a later time. For more details on this scenario, see "Rate limit temporarily exceeded" shows as Block Reason for blocked or delayed emails.

 
Company may not, and Company’s employees and other users are not authorized or permitted to distribute, publish, or send through the Trend Micro Email Security service: (1) any spam or bulk mail, including, without limitation, any multiple unsolicited advertisements, solicitations, commercial e-mail messages, informational announcements, “mail-bombing,” or promotional messages of any kind; or (2) messages or files that create the potential for disruption or overuse of Trend Micro’s networks, interconnects, and/or servers, by virtue of quantity, size or otherwise. Any non-compliance with the foregoing by Company shall be sufficient cause for Trend Micro to suspend, disable, or terminate all access to and use of such Trend Micro Email Security service by Company.
 

Common Questions

  • What will happen if the the rate limit has been reached/exceeded?
    When the sender IP or the recipient triggers the TMEMS rate limits, TMEMS will temporarily reject the emails from that sender IP or to the recipient, and returns the error code 4xx.
  • When will TMEMS accept the emails again?
    If the email sender client follows the RFC's definition, the email sender client should re-send the emails based on their resend strategy.
  • Is it possible to disable or by-pass the rate limits for inbound/outbound mails?
    By-passing or disabling the rate limits for inbound/outbound mails is not recommended, because this is implemented to prevent spamming and domain attacks. However, rate limits can be temporarily disabled or by-passed for special cases, which will require evaluation by TMEMS development team including the Product PM.
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Category:
Troubleshoot; Deploy
Solution Id:
000233680
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