Email sending limits on HENNGE Email DLP service

 

for Google Workspace / for Microsoft 365

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To keep the systems stable, the HENNGE Email DLP service has the following sending limits per tenant as well as per user. The limits are equally applied regardless of the service you are using (Google Workspace/Microsoft 365) and the email destination (Internal destination/External destination.)

If a user or tenant exceeds the email sending limits, an error message will be sent to Google Workspace/Microsoft 365 from the Email DLP service.

We appreciate your understanding as this is required to provide a stable service.  If you have any questions, please feel free to contact a HENNGE Customer Success Guide.

* January 13, 2021: Improving error messages to make them easier to identify the cause for users. (Previous error messages)
* May 12, 2021: Administrators can now remove some restrictions listed in the "2.Blacklisting" section.

1. Rate-limiting

1.1.
[Error Code] 450 (temporary error)
[Error Message]
Peak SMTP relay limit exceeded.
[Details]
This restriction will apply when a
sender address sends emails to over 600 recipients per 10 minutes window. (*1)(*2) Once the state is back to normal, the limit will automatically be removed. Emails sent while the restriction is applied will be automatically resent.

1.2.
[Error Code] 550 (permanent error)
[Error Message] Peak SMTP relay limit exceeded.
[Details] This restriction will apply when a sender sends emails to over 10,000 recipients per 24 hours window. (*1)(*2) 
Once the state is back to normal, the limit will automatically be removed. Emails sent while the restriction is applied will NOT be automatically resent. The sender is required to resend the emails listed in a Non-Delivery Report (NDR).

2. Blacklisting

2.1.
[Error Code] 550 (permanent error)
[Error Message] We detected a high volume of bounced emails coming from [you/your organization] over a short period of time. To protect our users from spam, emails from [you/your organization] have been blocked. [You/Your organization] will be automatically unblocked in <remaining block duration>. For further assistance, please contact the system administrator.
[Details] After the passage of <remaining block duration>, the restriction will be automatically removed. A system administrator can also manually remove the restriction via the HENNGE Email DLP admin console. Please refer to this article for how to remove the restriction. Emails sent while the restrictions is applied will NOT be automatically resent. The sender is required to resend the emails listed in a Non-Delivery Report (NDR) themselves.

2.2.
[Error Code] 550 (permanent error)
[Error Message] We detected a persistently high volume of bounced emails coming from [you/your organization]. To protect our users from spam, emails from [you/your organization] have been blocked. [You/Your organization] will be automatically unblocked in <remaining block duration>. For further assistance, please contact the system administrator.
[Details] After the passage of <remaining block duration>, the restriction will be automatically removed. A system administrator can also manually remove the restriction via the HENNGE Email DLP admin console. Please refer to this article for how to remove the restriction. Emails sent while the restrictions is applied will NOT be automatically resent. The sender is required to resend the emails listed in a Non-Delivery Report (NDR) themselves.

2.3.
[Error Code] 550 (permanent error)
[Error Message] We detected an unusual rate of unsolicited emails coming from [you/your organization]. To protect our users from spam, emails from [you/your organization] have been blocked. [You/Your organization] will not be automatically unblocked. For further assistance, please contact the system administrator.
[Details] This restriction will not be automatically removed. To remove this restriction, a system administrator needs to contact a HENNGE Customer Success Guide(Please refer to this article for notes of the delisting process.)  Emails sent while the restriction is applied will NOT be automatically resent. The sender is required to resend the emails listed in a Non-Delivery Report(NDR) themselves.

2.4
[Error Code] 550 (permanent error)
[Error Message] Action has repeatedly been taken against [you/your organization] for sending unsolicited emails, but the issue was not solved. To protect our users from spam, emails from [you/your organization] have been blocked. [You/Your organization] will not be automatically unblocked. For further assistance, please contact the system administrator.
[Details] This restriction applies when a sender has repeatedly been restricted within a certain period of time. This restriction will not be automatically removed. To remove this restriction a system administrator needs to contact a HENNGE Customer Success Guide, but before it is removed, the sender must ensure that unsolicited emails like the ones which have recently caused restrictions to be applied will no longer be sent(Please refer to this article for notes of the delisting process.)Emails sent while this restriction is applied will NOT be automatically resent, and the sender is required to resend the emails listed in a Non-Delivery Report (NDR) themselves.

 

(*1) The HENNGE Email DLP service analyzes an email for each recipient. For example, if three recipients are set in an email, that will be counted as three destinations.

(*2) In the case where a user sends a large number of emails, e mail service providers (including  Google Workspace, Microsoft 365, mobile carriers, and web emails) and anti-spam email organizations (such as information providers of RBL) may black-list the sender IP address as spam. Because of this, emails sent by other users or tenants may be impacted, and that is why this safety feature is implemented.  

 

 

          
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