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Domain example.com has exceeded the max defers and failures per hour WHM/cPanel

Background

Users on a WHM/cPanel might encounter the following message:

"Domain example.com has exceeded the max defers and failures per hour"

The settings for this is controlled in two places in WHM and the are set to intelligent defaults to avoid users inadvertently spamming causing IP blacklisting.

To see the two places where this setting exist, go to:

1. Account / Package Settings

WHM>>List Accounts>>Modify An Account

Scroll down and look for “Maximum percentage of failed or deferred messages a domain may send per hour”
This is the global setting that applies to everyone.

2. Tweak Settings

WHM>>Server Configuration>>Tweak Settings

Check the Mail section for “Maximum percentage of failed or deferred messages a domain may send per hour”

Be sure that if you make changes, they are chosen extremely wisely and that you clearly document them.

Also note that changes to individual accounts have a priority over the global setting.

References

WHM forum post max defers and failures
https://forums.cpanel.net/threads/domain-has-exceeded-the-max-defers-and-failures-per-hour.587231/

https://bit.ly/2VW7R60

https://forums.cpanel.net/threads/exceeded-the-max-defers-and-failures-per-hour-error.643813/

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