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Rate Limit Settings

Below are the rate limits for customers with FULL license for Trend Micro Email Security (Standard or Advanced).

  • 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.

Direction By IP address By Email address
Inbound 2000 messages* per minute per sender IP address 200 messages* per minute per recipient email address
Outbound 1,000 messages* per 5 minutes per sender IP address 500 messages* per 10 minutes per sender email address

For users with a trial license for Trend Micro Email Security, protection for outbound mail flow is not provided by default. If outbound mail protection is needed during the trial phase then users must raise a support case and provide a business use case for evaluation.

Below are the rate limits for Trend Micro Email Security Trial license:

  • For inbound traffic, the rate limit is based on sender IP and recipient domain.
  • For outbound traffic, the rate limit is based on sender IP and sender domain.

Direction By IP address By Domain
Inbound 2000 messages* per minute per sender IP address 100 messages* per hour per recipient domain
Outbound 1,000 messages* per 5 minutes per sender IP address 100 messages* per hour per sender domain
*One message represents one recipient.

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 Trend Micro Email Security rate limits, Email Security 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 Email Security development team including the Product PM.

  • How can outbound protection be enabled for trial account?

    Outbound mail protection is disabled for trial users. To enable this feature, purchase a full license or contact technical support.

For Reference, FAQ for outbound mail protection with full version license: Adding a domain

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