Fix cPanel Domain Exceeded the Max Defers and Failures Per Hour

Issue: Sending domain has exceeded number of failed or deferred messages and is no longer able to send email. This is defined in cPanel tweak settings: “Number of failed or deferred messages a domain may send before protections can be triggered”. When a domain sends the defined number of failed or deferred messages in an hour, and the “Maximum percentage of failed or deferred messages a domain may send per hour” has also been reached, the domain will be temporarily unable to send outgoing mail.

Solution: To immediately fix this issue, reconfigure the following settings more conservatively in cPanel’s tweak settings:

  • Maximum percentage of failed or deferred messages a domain may send per hour
  • Number of failed or deferred messages a domain may send before protections can be triggered

Then SSH into the server are remove the following file:

/var/cpanel/email_send_limits/max_deferfail_<somedomainname.com>

and restart Exim.

That domain will now be able to send email.

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