Domain has exceeded the max defers and failures per hour

Domain has exceeded the max defers and failures per hour

Error Explanation:

If you encounter an error  "Domain has exceeded the max defers and failures per hour (5/5 (100%)) allowed" within an email bounceback, it indicates that outgoing emails from your domain have triggered a server rule that halts any further outgoing emails. This situation arises when a domain account sends out emails that either encounter failures or are deferred. If these failures or deferrals surpass the server's defined limit, no additional emails will be permitted to be sent.

Resolution Steps:
This error stems from an hourly monitoring mechanism, whereby blocked domains regain the ability to send emails at the start of each hour. For instance, if you received this error at 6:45 pm, the block will be lifted at 7:00 pm, enabling the domain to resume sending emails.

How to Address Outgoing Email Limitations"

When dealing with limitations on outgoing emails, understanding the reasons behind these restrictions and how to manage them is crucial. This guide will shed light on the "how," "why," and prevention methods related to email output limitations.

Addressing the "How":

Default Limit Consideration:
For the majority of users, the default email limit is generally adequate. However, if you find that you or your users are surpassing this limit, reaching out to technical support becomes essential. Their expertise can help monitor your email activity and identify whether the issue stems from malware (automatic email scripts) or simply an elevated usage pattern by you or your users.

Different Hosting Scenarios:
If you're utilizing a Virtual Private Server (VPS) or a dedicated server, you have the ability to monitor this situation through WHM (Web Host Manager). On the other hand, for those on a Business level host (shared hosting), seeking support assistance is necessary, as they will need to carry out the monitoring for you.

Understanding the "Why":

Limitation's Purpose:
The imposition of an outgoing email limit on our email servers serves a critical purpose. Maintaining reasonable email-sending levels helps prevent the server from being blacklisted and marked as a source of spam. Such blacklisting would subsequently hinder your server's ability to deliver emails to multiple recipient servers.

Balancing Act:
While requesting an increase in the limit is an option, it remains restricted on shared hosting servers. Opting for a VPS or Dedicated server account provides greater control, but the onus of upholding your account's reputation falls on you. Engaging in extensive email output, especially for marketing purposes, can lead to your account being blacklisted by recipient servers. In such cases, rectifying the situation and getting the server de-listed becomes your responsibility (pertaining to VPS and Dedicated server accounts).

Preventing and Mitigating:

Monitoring and Communication:
Prevention is the best strategy. Vigilantly overseeing your email output is most effectively achieved through monitoring outgoing email statistics, particularly on VPS/Dedicated server accounts. For shared server users, setting user expectations by communicating usage limits is crucial.

Exploring Alternatives:
For those considering mass email distribution, exploring third-party options, which offer free mass mailing services up to a certain limit, can be advantageous. This approach liberates your account from potential outgoing limits. Another practical tactic is to stagger your email deliveries over time.


This guide aims to provide a comprehensive understanding of how to navigate outgoing email limitations. By adhering to the recommendations mentioned above, you can strike a balance between effective communication and responsible usage. If you have any queries or additional insights, please feel free to reach out. Your understanding and proactive approach will go a long way in maintaining a smooth email experience."


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