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Paid Credit Rate Limits

Users with a paid subscription for TrendAI Vision One Cloud Email Security Gateway Protection have the following thresholds:

  • Inbound Traffic:

    • By IP Address: 2,000 messages* per minute per sender IP.

    • By Email Address: 200 messages* per minute per recipient email.

  • Outbound Traffic:

    • By IP Address: 1,000 messages* per 5 minutes per sender IP.

    • By Email Address: 500 messages* per 10 minutes per sender email.

 

* - One message is calculated as 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.

Non-Paid (Trial) Credit Rate Limits

For trial users, TrendAI Vision One Cloud Email Gateway Protection focuses on inbound security. Outbound protection is disabled by default for non-paid accounts to prevent trial abuse. To enable outbound scanning during a trial, you must submit a support case and provide a business use case for evaluation.

  • Inbound Traffic:

    • By IP Address: 2,000 messages* per minute per sender IP.

    • By Domain: 100 messages* per hour per recipient domain.

  • Outbound Traffic (If approved):

    • By IP Address: 1,000 messages* per 5 minutes per sender IP.

    • By Domain: 100 messages* per hour per sender domain.

 

* - One message is calculated as 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 Vision One Cloud Email Security Gateway Protection: (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 Vision One Cloud Email Security Gateway Protection by Company.

Frequently Asked Questions (FAQ)

  • What happens when a rate limit is exceeded?
    When a sender IP or recipient exceeds the TrendAI Vision One Cloud Email Gateway Protection threshold, the system returns a 4xx error code and temporarily rejects the email.
  • When will the gateway start accepting emails again?
    Delivery resumes automatically once the message frequency drops below the limit. Most email clients following standard RFC protocols will automatically retry sending based on their internal back-off strategy.
  • Can I disable or bypass these rate limits?
    Disabling these limits is generally not recommended as they protect your environment from domain attacks and spam. However, for specialized business cases, the TrendAI Vision One development team can evaluate requests for temporary bypasses.
  • How do I enable outbound protection for a trial account?
    To activate outbound mail protection for a non-paid TrendAI Vision One account, you must either upgrade to a full license or contact Trend Micro Technical Support for evaluation.
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